I have seen something on the web but i cant find it anywhere, but it is a sound proofing wall paper. No idea on prices or where to get it from but i know it does exist!
Maybe someone else will know a bit more about it?
Can you not have the rad moved forwards 3" and put up a stud wall and sound proof it properly? I wouldnt bother with dot and dabbing with soundbloc boards, i sound coated a whole party wall and boarded with 15mm soundbloc boards, made fuck all difference!
Gavin.