Decent company which tries to point out salient matters of authenticity and uses photographs to indicate general condition. If you have a specific question about a watch you can contact them, as they have a designated Watch Team.
For this level of watch it is difficult to think of a better auction house in the UK, though Gardiner Houlgate is also worthy of your consideration.
One (of several) that you should avoid is Humbert & Ellis, more about which you can read here if you find the thread about a “£2k DRSD” (which wasn’t).