Thanks guys, i'm back. Upon more investigation, it's not the platter that's rattling. It's the tonearm!. Just when I tap on the plinth with the turntable switched off the tonearm moves and rattles, obviously when I have a record on it was almost like a siesmic quake.
I kept on telling the supplier that the tonearm wouldn't track properly, sigh, this has done my head in. They sent out there so called turntable expert. I find it unbelievable how they have not picked this up.
Has anyone come across this before?