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Not only are the walls thick, but there are security cameras at each corner of the floors with bedroom, so risky to stop outside doors for a quick listen.

Having said that noise does come out of the doors, but no where obvious to leave a USB stick

I've been to that airport (and surrounding areas) for jobs many times, but have never flown out from there.
I can't imagine any of the hotels around Stansted being good places for captures. It isn't located close to
any major urban areas (little Bishop's Stortford is the closest town). You would just have to hope there are
some horny travellers staying in your hotel.

Edit:

But if I had to stay at one of the hotels there, I would choose the Holiday Inn Express. It's cheaper
and looks more fun.

From TripAdvisor:

At 9.30 someone knocked on our door, before we knew what was happening, a female member
of staff entered our room with a male, when they realised the room was occupied, she giggled and
apologised, I can only guess that it was a Saturday nigh tryst?

One of the girls in my group found condoms in the bed! Absolutely disgusting.