Please ..NO queen excluder in a hive now.
. Cleaned and stored.
Crown board on top of frames, and a pack of fondant (well insulated to stop it drying ) on hole in crown board over where the bees are. other hole covered (I use a tile)
If bees to one side, adjust crown board position. In a month check if they have used it. If not, gently lift crown board to reassess position of bees. There isn't a problem in winter to open hive quickly to see if bees have moved on the frames. Just be aware of their situation within the hive. Insulate above the crown board as our Welsh friend soundly advises.