can anybody help...my heater has suddenly stopped blowing warm air,all heater pipes, radiator etc are clear does ayone have any ideas

No ideas on that one mate, but welcome to briskoda.

try giving the search a try.

Noddy type questions:-

Does it have climate, air, or just a heater/blower?

Is the blower fan still working on some or all settings? If it still works on the faster settings it's the blower control rheostat.

Is the engine warming up properly?

Is it not outputting hot air at all or just stuck on one heat output? In the latter case, it looks like the control for the output heat level has failed.