Didnt turn anything off Andy, just left the bleed screw undone in the bathroom rad, I'm guessing this lost the pressure and was causing it to make noise's.

Shut everything off, refilled to 2 bar, bled rad's, pressure back at 1.8bar, all rads are now on 1 full turn of lockshield valve's and I'm waiting to see how they do at that, finally got my head around what you were saying Al after i put the stella down

should just be a case of balancing them as you said earlier, cant believe i went through last winter with them like this, cheers dad

Cheers Al