Dear Phantomwireless net.
If you have the time and are really interested in Royal Signals badges.
Have a little look at my web site
www.signalsbadges.co.uk
You might find it interesting and if you go into the United Kingdom section you will see the answer to your question regarding Officer's and Other Ranks pre 1946 badges.
Kind regards
Chris Walker
www.signalsbadges.co.uk