Whilst thumbing through my copy of British Glass Between the Wars (editied by Roger Dodsworth, published by Dudley Leisure Services for Broadfield House Glass Museum, 1987, ISBN 0 900911 22 0) I spotted a sherry glass with the same style of decoration (page 93 if anyone wants to check the book) which is shown as being designed by Ernest Procter for Stuart & Son, Stourbridge, c.1934.
Just flagging it up in case anyone comes across one which isn't a Whitefriars item and needs to know who else was doing these designs.