The Free UK Business Directory https://freeukbusinessdirectory.co.uk is listed very highly indeed on Google (and other major search engines) for a huge variety of keyword phrases, some of which will relate to your business. The directory lists a wide range of businesses, non-profit organisations and charities in the UK and foreign companies who offer a service in the UK. In order for Google to take notice, you must follow guidelines and make sure you submit exactly the same information to every directory.