hi there all,winter's on it's way and I need to get this sorted otherwise the Mrs will be on my back constantly giving me ear ache!

I'm only getting a very occasional flow of hot water for bathing & washing dishes from my gas central heating,approx once every month for about 2-3 hours only.When the water does eventually flow it flows fine like normal.

The radiators seem to be fine & I had the boiler serviced in January this year.As usual the plumber didn't want to hang around to sort the hot water out for me then & he told me it's probably a faulty valve which I could probably sort myself.

Could anyone out there enlighten me with their wisdom as I've no knowledge whatsoever of central heating systems and can't afford to get one of these guys in to sort it for me.

Any ideas,comments,recommendations or links to related informative sites would be very welcomed.

thanks so much & hope I get at least one reply,ta

Crispin