They are a leather alternative to the webbing one, and the belt is the most commonly encountered item of the set these days. They will work, but it probably isn't what you are looking for.
Pattern 1939 Leather Infantry Equipment

This page shows the normal 'Enfield' holsters Pattern 1937 Web Equipment Mills had been making a very similar case as part of their commercial webbing sets in the '20s and '30s, some of which went to the RAF and some to the Canadians. Rod pipe was on the outside.