The Hide (chat thread)

Not sure if this warrants its own thread, so I'll post here for now.

Good/bad news. A swarm of bees has been trying to take over a disused chimney in my mother's house. There's a hole that goes through it sideways, through which a genius decided to put a gas pipe (yes, you read that right). On the inside of the house, there's vent that connects to the chimney that's used for a small extractor fan for the bathroom. It's on the ground floor, but it's still about 2.5 metres up. The rest of the chimney is hollow (nobody thought about blocking it in when the pipe was installed). So far I've blocked both side entrances with wads of cotton wool soaked in lemongrass/citronella essential oil, and I've removed the bathroom fan, and I've ushered out through the window the hundred or so bees that swarmed out of it in instalments. I've also fed them honey 'cause they were absolutely starving. The very bad news is that two nights ago my brother heard the buzzing, assumed they were wasps (without actually checking - don't get me started!), and sprayed a lot of insecticide inside the chimney, with the result that many of the poor little bees are now dying on the ground.

For the last hour, no further bees have flown out into the bathroom, but although I've used one of those pipe cameras Lidl sold a while back, I can't see properly inside the chimney to see if the queen is still in there. Meanwhile, on the outside, the swarm is getting bigger and bigger (but still not huuuge).

Is there anything I can do to entice them to move along, or to remove them without harming them? How can I check if the queen is actually there?