****** FIXED *******
This Problem has been bugging me for While now.
Fix this problem for less than £1.00.
You will most likely find that capacitor C3 has Failed. It is a 100nf rated at 275v. These are available from RS (148-474) or Farnell for around £0.35 each. If you are handy with a soldering Iron, remove the PCB and replace the capacitor.
Job Done.
Dave from Huntingdon., April 2012