Obviously the Board's search facility not being used again

It really is a storehouse of information.
On it you will find information on Jack Lloyd - his Stourbridge work is highly collectible and shows great skill.
To the best of my knowledge Irene Stevens worked and designed (from 1947 to 1957) for Webb Corbett only, and then as consultant until 1963.
Clyne Farquharson seems to have been equally loyal to Walsh from when he joined them in 1924 until the company's closure around 1951 - apparently his famous design, 'Leaf' was continued after this date under the Tudor Crystal trademark.
Ref. 'ART DECO TO POST MEDERNISM - A Legacy of British Art Deco Glass' by Nigel Benson and Jeanette Hayhurst - Text: Nigel Benson - Photography: Jeanette Hayhurst 2003.
'The Glass Of John Walsh Walsh 1850 - 1951 - Eric Reynolds - 1999.