Birmingham Special Constabulary Reserve info please

[billy4294]

I haven't been able to find out any information online about the Birmingham Special Constabulary Reserve. Does anyone know the answers to the following ?
A) When and why did the use of the wording ' Special Constabulary Reserve' come into use on the cap badge?
B) When did the use of the scroll cease on the badge?
C) Were the badges ever modified officially, by having the scroll removed? The reason for this last question is because, while searching for info online, I came across a badge described as a small Birmingham City Police badge ' officially' modified from the Special badge. The badge shown was definitely of a specials badge, with the dot at the centre bottom of the circle, rather than the diamond shape. Unfortunately only the front of the badge was shown so it was impossible to see if someone had just removed the scroll and filed it smooth or not. The badge was KC.
Thanks
Billyh.