Picked up a swarm this morning from a tree in a street. Lots of passers-by so I stayed with it for a while till the bees were almost all in the nuc. I wrapped a sheet round it to contain the bees under the mesh and around the entrance and drove home. I put the box in the shade for an hour or so before I drove to the apiary. When I got there the bees were all dead or dying, covered in honey. My mistake? I put a couple of combs in the nuc, and on a whim, added a frame with some honey. I've not done that before, and I know you don't feed a swarm, not for a few days at least. In a thoughtless moment, I guess I wanted to encourage the bees to stay in the nuc. And with the sheet wrapped round the box, the bees weren't able to ventilate the interior, and couldn't control the flow of honey. Horrible. A memory that will haunt me.