It can't be heard at idle, the bearings do rumble a little, but never rattle at idle.
It's definitely not heat shield, because that also rattles and I haven't got round to fixing it. It's a distinctly different sound. Nor is it hammering like a tappet. It honestly sounds similar to pinging, high pitched and fast.
Just pushing on the pressure plate, so yes, could be that. I may be swapping out for a 5speed soon, so I'll find out then
Cheers for the input.