I've noticed via the Invaluable.com website that a number of Auctions still seem to be happening around the UK. I thought they must be online only, but logging in and looking at one happening right now in Holborn, London it seems there are bids from the floor, so I guess people are there bidding in person.
Maybe they have people spaced out to be more than 2m apart but I still think this is an unnecessary risk.