Will a std. FN Timney and a Gentry or wisner 3 pos safety work on my 375 London Whitworth? I don't see why not but thought I better check..

Yes, with the usual fitting; they are just another 98 Mauser.

cocking piece might be slightly different, but should be just about the same ... IIRC, there is a "Shortone"b.. but, heck, i've slept since i did one...