I've been to:
London Dungeon Hire.
Excellent multi room dungeon with every imaginable piece of equipment and then some. The owner is a nice chap, gives you the guided tour then retires to a private part of the flat. He's in the building the whole time but you wouldn't know he's there's, but you have to be comfortable with that.
Clean, tidy, everything in good nick. Nice fluffy towels embroidered with the logo.
Blue door.
Disappointing. Whole place stinks of damp, they have dehumidifiers going but there's a serious problem. The place is also not clean, obvious no one properly cleans it, the floors are dirty and there was some kind of fluid on the benches which we had to clean off before we started. Equipment is just strewn around and not properly curated, a lot of it in poor condition - parts missing, ripped unholstert, frayed ropes and most concerning the winch steel wire frayed. Shitty old towels wihich were threadbare and stained. I would not return.
Peacock Parlour.
Excellent. Spotlessly clean, owner takes pride in it. Everything is perfect condition and perfect order. Smaller than the other two but enough there to occupy several hours.
I've taken WGs to each of these dungeons.