Filmed in March
They must have been freezing their bollocks off when they filmed that!
PUN INTENDED.
Quite common for such movies to be filmed out of season, and set dressing added afterwards.
In Carry On Camping, it was filmed in winter so the scenes in the camp, particularly the famous one where Barbara Windsor loses her bra. The set dressers had to actually paint what was a muddy field woth green paint, to simulate grass.
Yeah I remember reading about them painting the muddy field to simulate the grass, crazy lol.