The complicated rearrangement of Hive C left a problem: a gap of a few millimetres where the nucleus box meets the hive body. Every time I approached the hive the bees from inside behaved defensively and I smelled the distinctive alarm pheromone (it's an ester somewhat like Bananas).
This afternoon I returned to the box within a box which contained Colony 13.
It was placed with it's opening almost directly in front of Hive H. How could they not be delighted with the hive and march straight in. Perhaps the bees had other things going on. I decided to act.
I brought a large white board up to the mouth of the hive and bridged it with white paper card. I then carefully removed the inner box and shook it onto the board. To my dismay the bees started going over the edge of the board but not into the mouth of the hive.
I was called today to an unusual situation: a swarm on the pavement outside a house on a fairly busy street. When I arrived the bees were like a splat on the ground. They were next to a low Privet hedge, so I suppose that they'd fallen out of that.
I spoke to the house owner and got a box. This covered the splat while I went for my swarm catching equipment. When I returned they had started to cluster on a flap beneath the box. I had brought a larger box so I carefully placed small box with bees inside the big box.