Now this is where things get interesting. Progress Vulfix are based on the Isle of Man which is not really part of the UK. Not to worry, they are universally recognised as the premier british brush maker. They make and directly sell their own brand of Vulfix Old Original. And they make and sell the Simpson range through retailers. And they make several other well known brands. I guess they would make a Fido brand too at the right price.
Vulfix are easy to contact and you are assured of a pleasant response to requests for advice and information. Here is another link of interest:
A visit to Vulfix