Re that ISO backslash - that's one of the "gaps" that doesn't quite look right on a UK ISO board, yes.
Because it's not the only "gap", this set will be providing nicer F/nav for me instead to go with GB mods.
My current keys are almost brand new WoB so not too bad.
Bottom line - even if not everyone's ideal layout, I'm not surprised these are selling well. Just work out the price per cap...