Just like buses: Nothing for ages then along come two.

[Maxwell Smart]

When I looked, there were THREE!

The two more expensive ones are configured as a regular issue No 3 Mk1* (T) rifle. Rifles of this style were used in action in WW2. Unable to comment as to provenance.

Not familiar at all with the first one though; not a standard set-up. Belding & Mull 3 power scope and that style of mount I think is mid-20's dated, so perhaps unlikely to be UK military.