Hi Alan,
You would be the best one to know what your keywords are, on every page of your website you will have meta tags and a description. Meta tags simply explain to browsers and search engines what the page is about so it can understand, however meta tags are very old hat and sometimes referred to as fossils, it's good to get them in there but they don't hold too much weight. I'm sure the only search engines that checks these currently is Microsoft Bing however don't quote me on that. Make sure your meta description tags are in there also, a short sentence on what the website is about.
Your title tags are important and what a lot of search engines look at for a short description of the page, different title tags throughout your website for different pages will help here also rather than being repetitive. The keywords people search for on Google are what match up with the blue linked words (page titles) on the results. Titles must start with the most important keyword followed by the second most important, but make sure they make sense to people reading them - for example "Window Cleaning Wimbledon | Johns Window Cleaners".
The content of your pages is very important, make sure all your keywords are on every page near the top, Google will check the title tags as well as the content to see if what the user is searching for matches your site.