The 1940 Parker Hale catalogue (Service Section) shows No1's for sale :

Brand new, ex BSA factory £11 - 11 - 00
Secondhand and overhauled £6 - 0 - 00

As a matter of interest Headspace gauges were 12 shillings each.

I would have thought that in 1940 the Military would have needed all they could get - maybe PH did not have that many to sell.