It was quite a challenge fitting a 4 person tent into the living room, but it wasn't quite as bad as we'd expected!
We went shopping in the daytime and armed ourselves with plenty of snacks :@) Crisps, marshmallows, sweets, but also some Fridge Raiders and fruit pieces!
We turned off all the lights for effect and had just a couple of tealight candles lit. We used battery-powered head torches for navigating the rest of the house.
It was quite fun, so I'd recommend it to keep the kids entertained!