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Thanks Brian, Also, as mentioned the two radiators in the loft did have air in them. Having bled them and then being ok and hot (this morning), one of them is all cold at the top again now. I have just tried to bleed it and got the usual hissing sound. As a complete novice, how come it needs...

Bear with me - this may be a long story/question. Firstly, boiler is a Ravenheat RSF 100 which is about 2 years old. Recently we have had a loft extension and had two new radiators added which all worked fine. Anyway, last week the hot water stopped working properly - ie it ran hot and then...