A few miles away in Peterborough here and to be honest, unless there's a good reason (lack of fitness, knees etc etc) there's no need for a compact, or more particually the 34T inner . Its as good as useless round here. But no problem... for £15 to £20, buy a 38 or 40T inner ring (110BCD of course) and convert your bike to a 50/40 say. Then you'll find the 40 (or 38, depending on your choice) will get regular use. Its infinately more useable that way, especially if you want to spin.
Replacing the inner is easy too, 1/2 an hour, you dont even have to take the chain off. No other mods required, barring perhaps moving the dog fangto the new position by the 38 or 40.