Cheers,
I removed the copper that I put on the cables but left it on the sides (shielding the sides was recommended in the moog forum).
At rehearsals on Monday it had little or no buzz, so it could well be where it is in the house. I'm using a Godlyke PSU with a daisychain that does make a bit of squeal, but I think it's due to it being digital switching & if I roll off a bit of treble (VLE knob up a couple of notches does it) then it's gone.