Well done! Glad to hearIt's fixed!! The mains water supply was off yesterday as maintenance was being carried out in the area. I don't know whether this has anything to do with my issues. Anyway when the water supply came back on I took your advice and bled the radiators again. I got air out of the kitchen radiator! I put the heating on and it was a lot quieter. I bled the radiators again and now it is back to normal and the rads and pipes are quiet. I've checked it this morning and it's fine. I can't thank you all enough. Not only did you give me advice, but you never let me feel I was alone with the problem. You really are amazing!