Some new Police badges and questions

[billy4294]

Some recent purchases for views and opinion, nothing rare.
Re the Blackpool Collar. Would I be correct in assuming that this badge was a generic corporation type badge and could be worn by other uniformed services?
In regard to the BTP badge. I assume this is a senior ranks badge, but I have seen this design badge without enamel. Was the non enamel star for other ranks? or is it just that the enamel has broken off these badges?
The Notts SC I have shown simply because I had no idea Hiatts made badges. Or did they use a badge manufacturer?
The MOD badge is Toye, Kenning and Spencer.
billyh