Yes, it is possible to track down someone by their telephone number in the UK. There are a few ways that you can do this: 1. Use a reverse phone lookup service - This will help you to find out who has that number and where they are located. 2. Contact numbers databases - You can contact these databases and ask for help in finding out who has that number. 3. Check social media - Sometimes people post about their new address or telephone number on social media accounts. By checking these posts, you may be able to piece together information about the person who has the number.