Or at school? We had an armoury with about 250 SMLE from WW1 and later WW2 and also some new ones. We also had a couple of dozen Bren. In the attic the ammunition was stored above a dormitory - went in once - 25,000 rounds of .303 ball were stored there in ammo boxes.
So was that you up on the roof in the final scene of
If P-N ?
