While talking of the metal tin for the cleaning kit, I seem to remember from Malaya days that it originally had a B1/BJ xxxx part number, indicating that it was designed for the No5 rifle because the No5 didn't include a place for the basic cleaning kit as did the No1 and 4. It was also issued for the Sterling SMG but I don't think it was issued for the No4 but I'll check. The design changed slightly for the L1A1 and then became the plastic universal type.

Interesting (?) subject though