I'd suggest you join the Panther Owners Club UK:https://www.pantherownersclub.com/
I'm in N.Z., but still found it well worthwhile. They are a really helpful bunch and have an excellent spares scheme. If the club don't have any spares you need, there are bound to be members who do.
Alternatively, or as well, check out the Panther Owners Club Facebook page: https://www.facebook.com/groups/11553580477/
- its open so you can see postings and they'll add you without any problem. There are some very clued up Panther owners on your side of the ditch - especially a guy Dan who is in Darwin.