Not wishing to take over Jonny's thread, but as I'm in a similar situation.
Hopefully the attachment works! The picture of the smaller hive was last night, bunch of bees outside, inactive, swarm? too hot (solid floor)? overcrowded?
This morning they are much the same, this is the half of the hive that was split and left to receive the 'fliers'. Going into the hive this evening, sealed brood, no queen cells, bees are unpleasant in that they are keen to fly at you rather than attack, and absolutely FULL of bees, the queen was in the other half that was removed about two weeks ago.
Check on one of my new queen cells, she is out, okay lets not disturb them any further.
Decide to risk it all and combine in the safest way I could come up with -
Other picture is the result, bottom is the original box, then a small shallow (empty,no frames (why would I have any ready?) just to give them some space to hang out instead of on the street, then is a plastic queen excluder sandwich with paper in the middle, thats two excluders turned right angles ro each other and paper in the middle with slits then the shallow with my new baby queen and family. Strict instructions have been left to play nicely