Last season, we found two bumblebee nests, the first under a tiled roof, which survived the season, and a second, in an old badger excavation hole behind the shed.
I thought the 'Badger-hole' nest looked to be a fairly vulnerable, so in true nature 'tooth and claw' I setup my trail camera to see if anyone else also thought so... Pending something dramatic happening to my roof, the first one stood a much better chance of survival.
and, low and behold, along came a badger:
Our solution for this years' bumblebee queens who I keep evicting from my shed, looks like this:
Derek Jones' 'Bird Bee and Bug houses book:
Apparently they like a room for poo and a room for general living.
I have similar preferences :)