Most hives in the UK are the "National" type. 18 1/8 inches square. If each
super is put so that the frames run at right angles to the one below it
instead of in parallel the tendency for the bees to link adjacent frames with
burr comb which forms a bridge for the queen is much reduced. If your hives
are square it may be worth trying this instead of a queen excluder.
Chris Slade