LeTiss brought up the knotty issue of assessing the creditability of advice again but it got lost in that thread. PC is one way but even a lucky newbie can pay that until the wheels fall off, and I don't pay PC even though this pays my bills, so....
What's missing that other trades have ? an Association/Federation/Institute of Master Sports Traders.
£20 quid a year, you sent in your PL, you get a certificate and a sticker for your van

The big guys can apply for a gold certificate ...but that's £40.
I might do it, I reckon I could get 10 members and that's enough for a christmas dinner & drinks.