My recollection, which won't be 100% as it was a couple of years ago, is that there were two group admins. One was determined to have friendly discussion of all aspects of photography using film in the UK and by UK residents when travelling abroad...including recommending businesses to buy film and related services from....and the other seemed OK with personal insults, trolls and doing photography "his way" using his personal favourite retailers.
Many people ended up leaving the group for an offshoot set up by the admin was was behaving in a friendly, inclusive manner. He does happen to be a photography shop owner himself but doesn't stand in the way at all of people recommending the services of his competition. I believe the old group changed it's name to "UK film Photography and Darkroom" under the ownership of the chap who had behaved in such a manner that there was a large exodus of members (a certain James)/
However, I do not know what goes on in there as I am not a member any more. It is conceivable that he's cleaned up his game, perhaps sorted out personal problems which he seemed to be going through...and maybe it's a wholesome place again. Lockdowns affected us all adversely and it is possible his errors of judgement were out of character.
but it was certainly a very unpleasant place for a while.
510-Pyro does have a cult-like following in UK and Europe and there's probably enough market demand to keep more than one supplier in business if you choose to get into it. Given your knowledge, experience and background you might come up with a Pyro developer that's demonstrably better than other Pyro developers.
