In2Minds wrote:
what size gap should I leave between the skirting and floor in a
bathroom, or any other room for that matter ?

I was thinking ~3mm to allow for carpet/vinyl to be tucked under ?

Should definitely not be tucked under at all; basically the skirting
sits on the floorboards. Although, may be a good idea to set it just a
gnat's off the floor, so that floorboards can be lifted later if need
be, and they aren't jammed in place at the ends.

David