.22 Rifle used in Feathermen

Sigh! Sorry about this but it's bugging me. what is the 1930's (I think) .22 rifle that is used by the David Maison character in the desert tunnels.
While on the subject is it any good?
I have the book but I'm away from Blighty at the moment and google isn't being my friend.
It was a "Rook Rifle".

Sort of between a .223/5.56 and .22WMR and were made by quite a few companies in various odd ball calibres.

Unsuprisingly they were used for shooting Rooks in Rookeries as they were quite flat shooting.
Ta but book mentions maker IIRC. That's what is bugging me. I mentioned it in conversation and now it's bugging me What it was.

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