SEO Explained
What Is SEO? A Complete Guide to Search Engine Optimisation
SEO (Search Engine Optimisation) is the process of improving your website so that it ranks higher in search engine results when people search for the products, services, or information you offer. In the UK, that overwhelmingly means Google, which holds around 90% of the search market.
The concept is straightforward. When someone types a query into Google, the results they see are ranked in order of relevance, quality, and trust. SEO is the work you do to convince Google that your website deserves to appear at the top of those results. The higher you rank, the more people find you. The top three organic positions on Google receive over 60% of all clicks. If you’re not on page 1 at all, you’re effectively invisible for that search term.
What SEO actually involves is broader than most people realise. It’s not one thing. It’s a combination of disciplines that all work together: the content on your pages, the technical setup of your website, the links pointing to you from other sites, your local presence, and increasingly, how visible you are to AI search tools. This guide covers each of those areas and links to detailed guides on every topic if you want to go deeper.
How Do Search Engines Decide What to Rank?
Google uses automated systems called algorithms to evaluate every page on the web and decide where it should rank for any given search query. It’s often quoted that Google considers over 200 ranking factors, but the most important ones come down to three things: relevance (does your page match what the person is looking for?), authority (does Google trust your website?), and user experience (is your site fast, easy to use, and helpful?).
Before Google can rank your page, it first needs to crawl it (visit it and read the content) and index it (store it in its database). If Google can’t crawl or index your pages, nothing else matters. That’s where the technical side of SEO comes in.
What Is Technical SEO?
Technical SEO is the behind-the-scenes work that makes your website accessible to search engines and usable for visitors. It covers site speed, mobile friendliness, crawling and indexing, security (HTTPS), structured data, and how your URLs and site architecture are set up.
This is the area most businesses overlook, but it’s the foundation everything else sits on. If your site is slow, has broken pages, blocks Google from crawling important content, or has been built without SEO in mind, your rankings will suffer regardless of how good your content is. We regularly find that the majority of ranking problems on new client websites are technical rather than content-related.
Structured data (also called schema markup) is an increasingly important part of technical SEO. It’s code you add to your pages that helps Google understand the meaning behind your content, not just the words on the page. For UK businesses, LocalBusiness schema, FAQ schema, and service schema can all improve how your site appears in search results.
If your website was built by a designer who didn’t consider SEO, there’s a good chance there are technical problems holding you back. Our guide on how to tell if your web designer is hurting your SEO covers the most common issues we see.
What Is On-Page SEO?
On-page SEO is the work you do directly on your web pages to help them rank. This includes your title tags, meta descriptions, headings, content, images, internal links, and URL structure. If technical SEO is about whether Google can access your site, on-page SEO is about whether Google can understand what each page is about and whether it matches what people are searching for.
In our experience, on-page SEO accounts for the vast majority of ranking improvements we deliver for clients. Getting title tags right, writing content that matches search intent, structuring pages with clear headings, and linking pages together properly are the basics, and most websites simply haven’t done them well.
Content quality matters enormously. Google rewards pages that genuinely help the reader, and penalises thin, duplicated, or low-value content. That means creating content with a clear purpose rather than churning out pages for the sake of it. And while AI writing tools are increasingly capable, mass-producing AI-generated pages is one of the fastest ways to attract a Google penalty. Whether you use AI tools or a human copywriter, the content needs to be original, useful, and written for real people.
What Is Link Building?
Link building (sometimes called off-page SEO) is the process of getting other websites to link to yours. Each link from another site acts as a vote of confidence in Google’s eyes. The more relevant, trustworthy websites that link to you, the more authority your site builds, and the higher it can rank.
Not all links are equal. A link from a respected industry publication or news site carries far more weight than a link from a random directory. And low-quality links, such as those from spam sites or paid link schemes, can actively harm your rankings. The approach that works in 2026 is earning links through genuine value: creating content worth linking to, building relationships with relevant publishers, and being listed on the directories and professional bodies that matter in your industry.
What Is Local SEO?
Local SEO is a specific branch of SEO focused on improving your visibility in location-based searches. If you run a business that serves customers in a particular area, whether that’s a single borough or an entire region, local SEO is how those customers find you.
The most visible element of local SEO is the Google map pack, the three business listings that appear at the top of local search results alongside a map. Getting into the map pack requires a well-optimised Google Business Profile, strong reviews, consistent business information across the web (known as NAP consistency), and good local signals on your website.
Google reviews are a major factor in local rankings. The number of reviews you have, how recent they are, and your average rating all influence where you appear. If you’re dealing with fake or spam reviews, our guide on removing spam Google reviews walks through the process step by step.
Understanding how people actually search for local services matters too. Most people don’t type postcodes into Google. They use neighbourhood names, borough names, or simply let Google’s location detection handle it. We’ve covered this in detail in our post on why people don’t search by postcode.
Why Does Keyword Research Matter?
Keyword research is the starting point of any SEO campaign. Before you optimise a single page, you need to know what your potential customers are actually typing into Google. Targeting the wrong keywords means either chasing terms nobody searches for, or competing for terms so broad and competitive that you’ll never rank.
Good keyword research identifies the terms with the best combination of search volume, relevance to your business, and realistic ranking opportunity. For most businesses, long-tail keywords (longer, more specific phrases like “emergency plumber South London” rather than just “plumber”) are where the best opportunities lie. They’re less competitive, more targeted, and the people searching for them are usually closer to making a decision.
How Is AI Changing SEO?
This is one of the most significant shifts in search since Google itself. AI tools like ChatGPT, Google Gemini, and Perplexity are increasingly being used as alternatives to traditional search. People ask these tools questions and receive direct answers, often with citations to websites. Getting your business cited in those answers is becoming a new dimension of search visibility.
This emerging field is called Generative Engine Optimisation (GEO), and it builds on many of the same principles as traditional SEO: clear content, strong entity signals, structured data, and demonstrable expertise. AI tools pull from the same web content that Google indexes, so a well-optimised site performs well across both.
Entity-based SEO is closely related. Rather than just matching keywords, Google and AI systems are increasingly trying to understand what your business actually is, what it does, and how it relates to other things. Building clear entity signals through consistent naming, structured data, verified profiles, and authoritative content helps both Google and AI tools recognise and recommend your business.
At the same time, zero-click searches are rising. Google’s own AI Overviews and featured snippets now answer many queries directly on the search results page, meaning users don’t always click through to a website. This changes how we think about SEO success. Visibility and being the cited source matter even when that doesn’t translate directly into a click.
That said, the fundamentals still apply. As we’ve covered in our analysis of LLM traffic versus Google search, traditional Google organic search is still the overwhelmingly dominant source of traffic for UK businesses. AI search is growing but it hasn’t replaced Google. The smart approach is to optimise for both.
How Do You Measure Whether SEO Is Working?
Measuring SEO comes down to tracking a handful of core metrics: organic traffic (visitors from unpaid search), keyword rankings (where your pages sit in Google for your target terms), and conversions (whether those visitors are actually turning into enquiries or sales).
Google Search Console and Google Analytics are the two essential tools. Search Console shows you exactly which queries your site appears for and how often people click through. Analytics shows you what happens after they arrive. Both are free.
SEO is a medium to long-term investment. Meaningful results typically take three to six months to develop, though quick wins are possible where there are obvious technical or on-page issues to fix. If you’ve been investing in SEO and aren’t seeing results, our guide on why your SEO might not be working covers the most common reasons campaigns stall.
SEO vs PPC: Which Should You Invest In?
This is one of the most common questions businesses ask when thinking about search marketing. SEO and PPC (Pay-Per-Click advertising through Google Ads) both put your business in front of people who are actively searching for what you offer. The difference is cost structure and timeline.
PPC delivers instant visibility but stops the moment you stop paying. SEO takes longer to build but generates traffic without a per-click cost, and the results compound over time. For most businesses, SEO delivers a better cost-per-lead over the medium to long term, particularly in industries where Google Ads clicks are expensive. The strongest approach is often to use both together: PPC for immediate leads while SEO builds the organic foundation underneath.
How Much Does SEO Cost?
SEO pricing varies enormously. Some agencies charge thousands per month. Some offshore providers charge almost nothing and deliver results to match. The right investment depends on your industry, competition, and goals.
We’ve always believed that effective SEO should be accessible to small and medium-sized businesses, not just those with enterprise budgets. Our own SEO campaigns start from £495 + VAT per month, which includes technical audits, on-page optimisation, keyword research, link building, and monthly reporting. We’ve published a case study showing how this approach delivered a 280% traffic increase for one London client within two months.
The most important thing when choosing an SEO provider is transparency. You should always know exactly what work is being done, what results it’s producing, and whether it’s generating a return on your investment. If your current provider can’t explain that clearly, something is wrong.
Where to Start
If you’re new to SEO, the priority order is: get the technical foundations right first, then focus on on-page optimisation to make sure your pages target the right terms and match search intent, then build links to increase your authority. If you serve a local area, get your local SEO set up properly from the start.
Every guide linked from this page goes deeper on its specific topic. Use them as a reference whenever you need more detail on a particular area. And if you’d rather have someone handle it for you, get in touch and we’ll tell you honestly what your site needs and what results you can realistically expect.
Frequently Asked Questions
What does SEO stand for?
SEO stands for Search Engine Optimisation. It’s the practice of improving your website so that it ranks higher in search engine results, primarily Google in the UK. This includes optimising your content, technical setup, and online authority to increase your visibility when people search for what you offer.
How long does SEO take to work?
Most SEO campaigns take three to six months to show meaningful results. Some quick wins are possible in the first month or two if there are obvious technical or on-page issues to fix, but sustained ranking improvements and traffic growth build over time. SEO is a compounding investment: the longer it runs, the stronger the results become.
Can I do SEO myself?
Some of it, yes. Google Search Console is free and will flag your most critical issues. Basic on-page optimisation like improving title tags and writing better content is achievable without professional help. The more technical aspects, like site architecture, schema markup, and backlink analysis, are where professional expertise adds the most value.
What is the difference between SEO and PPC?
SEO focuses on earning organic (unpaid) rankings in search results. PPC (Pay-Per-Click) is paid advertising where you bid to appear at the top of search results and pay each time someone clicks. SEO takes longer but builds a lasting asset. PPC delivers immediate visibility but stops when you stop paying. Most businesses benefit from a combination of both.
Is SEO still worth it in 2026?
Absolutely. Google organic search remains the dominant source of website traffic for UK businesses. While AI search tools are growing, they haven’t replaced Google, and the same optimisation work that helps you rank in Google also helps you get cited in AI-generated answers. A well-optimised website is the single most valuable long-term marketing asset a business can build.
