Not really a "bad thing" - it just confirms that the hive is in the chimney/flue. I'd be inclined to check out some pest controllers and get some advice on getting rid of it. Are you renting or do you have the leasehold/freehold on the flat (can you offload this onto a landlord/building manager/tenants' council or whatever)? Is the chimney shared? Do you know if other residents are having similar incidents?
From the photo they're bumbles or similar, which means no honey stores worth a human bothering about. (Honey bees, small dark, less fluffy than bumbles generate lots but getting at it is a whole different story).
Yeah. I'd still mention it to your landlady though (lest you become known as 'that goth bird who put a bee's nest up in the chimney and then buggered off').
no subject
(I'll get my coat...)
no subject
no subject
no subject
Good luck :/
no subject
the hatter
no subject
no subject
Good job you're moving out soon...
no subject
no subject