...getting *out* of London! I've been to Wales twice, and both times I've found the locals perfectly pleasant. If you don't bother them, they leave you to get on with your own stuff. If you talk to them, they don't run screaming as if you've just set fire to their hands, which seems to be the theme in London.
To me, that would bode well for getting out of the house and having a wander.
I can imagine that being stuck in a house with 30 people would be a bit hectic, but you've not said how long it's for.
If the house is *really* in the middle of nowhere, find a gun and go target shooting - that'll get your stress down a bit. It gives you something comfortably destructive to focus on :)
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