So, I wasn't looking specifically for trinket sets, and have no ideas of patterns, but came across a newspaper article from 10th April 1953, in the Sunderland Echo. It related to an attempted break-in at the Matthew Turnbull works in Sunderland.
One of the perpetrators, Dennis Conlin (21), is quoted as saying "My mate works there and knows the place. He was after trinket sets. I was drunk".

So, whilst it doesn't help identifying unknowns, it at least indicates another manufacturer.