I used the Horsley boards for 3 or 4 splits last year with mixed success. Two worked fine ... the others dwindled and the queens scarpered or were lost.

It seems guidance on their use is generally poor and, above the board, bees need feeding throughout or at least until there are plenty of flying bees or they are opened right up to the boxes below.

The slides worked well in keeping the bees in their intended boxes.

I'll try again this year, assuming colonies ever reach maturity after such a long cold Spring.

I might also try converting one of my boards to a Morris board but again, does someone have tried-and-tested guidance on using these?