My hot water tank is getting hot, and my radiators are red hot but when I go to have a shower the water is cold, I have found if I turn the cold tap on in the hand basin the water is a bit warmer in the shower,does this mean I need a new boiler?

Is this a steam or hot water system? Is yours a gravity or circulating system? Could be air bound but sounds more like your circulating pump, if so equipped, isn't working.

Not a boiler issue. Either a recirculating pump or perhaps a cross connection across a single handle faucet or shower valve. This type of problem can be a bit tricky to work through, but with a little patience and some guidance you should be able to resolve the problem without too much trouble. Let us know you are still around... see what we can do to help.

Back to you...

Mark

Thanks for your help, I found something on the internet that seems to have worked.

Care to share your solution with us?