Think you might have to break out the type writer again Peter L if this is anything to go on, way above my pay grade found a few newies some years ago at the back of a gunshop so snaffled them at a reasonable price, they weren't cheap but reasonably priced.
303 No.4(T) Sniper Rifle: An Armourer Peter Laidler: Greenhill Books 9781853671449 - GlassFrogBooks
That copy is priced at for us Colonials - $1,163.oo Australian........................