A No.5 bayonet ‘could’ have been used with a variety of WWII and postwar Britishicon bayonet frogs, of which there are many. Then remember that there were fittings to carry bayonets on the side of 1944 and 1958 Pattern ammunition pouches.

Personally, I think a No.5 would look good with one of the jungle green 1944 Pattern frogs:

Pattern 1944 Web Equipment