Welcome to the Forum.
You might find these albums useful. They list all known OTC, JTC and CCF badges as well as showing a proportion of those.
https://www.britishbadgeforum.com/fo...p?albumid=1602
https://www.britishbadgeforum.com/fo...p?albumid=3398
In addition there were many Cadet Corps units that predated 1908 or sat outside the Junior Division OTC. These are not well recorded but identified unit badges are listed here:
https://www.britishbadgeforum.com/fo...m.php?albumid=
This list is not complete by any means.
Alan