Anybody had any issues with flat bottom/ under trays at SVA?

Adrian

They might ask you to remove it if they can't access things like steering and suspension - otherwise I can't see that it would jepardise anything

No problems with my car.
I just made sure that I photographed my seat belt bushes from underneath before putting the sheet on.
I gave the photos to the sva man to prove that the bushes were welded both sides.

So far as I am aware they have to inspect the car as presented, can ask for bonnet, engine cover, boot etc to be opened, that's certainly the case for MoT. On my car he virtually stood on his head in the cockpit trying to see the seat belt mounts!