Saint Joan Jig-Saw Puzzle Library

An interesting British library brand of good quality plywood puzzles which shows seasonal and weekly hire rates for the various sizes stocked.
The first two examples I have seen, including St. Margaret of Scotland are both of similar size and cutting style and both have a label inside the lid which advertises the Harlequin Jigsaw Libraries. Could it be that the Saint Joan library is a form of franchise of the larger Harlequin organisation?
The front label carries an inscription at the lower left of S & D Ltd.-63340
I am very keen to hear from anyone who can provide more details on this library and its puzzles.