Is it Alan Thomas, Shaney? If so, then yes that seems to have been the thirties and that's too late obviously
http://gadetection.pbworks.com/Thomas,+Alan - what a shame, they sound lovely, "Maurice and Cyril" - like two little mice ;-)
Dot you may have nailed it, if McNeile's real name was known at the time - Wikipedia says his pen name was Sapper. But if he appeared in magazine interviews and such, it may well have reached Sweden.
Thanks an awful lot folks, and keep'em coming. Haven't you got any cousins as well, Lofty, do chuck'em in, by all means, every little bit helps ;-)