Hi there,
Last year I had a night in a hotel in South Kensington. Hearing muffled noises through the wall, I slipped out and listened at the door: it was a rambling place and some of the rooms were in twos in a small lobby of their own.
Definitely some action going on. However, the noise of the bin seemed like it was in the same room, so maybe more than two people were involved. Seems like I only got the end of it, though.
More from the same evening to follow!
ST