If you don't have one just tell me how big you want it, and what area of the UK you need. I can zoom in for as much detail as you want. Getting the right amount of detail and just the towns that you want is difficult. For that kind of control you would need to import a WMF into a program like Draw Plus, Page Plus click here or Corel Draw, type in the names of the towns and export the whole as a GIF.
GIF Image: click here
WMF: click here