Way back when I used to fly from Sleap as a PPL, I started to train as an A/G operator. I gave up after the chap supposedly teaching me demanded that I give clearances, tell aircraft when to taxi, and similar. I told him (fairly tactfully) that he shouldn't be doing that; he told me I had to do it his way as he'd been doing it for 16 years!!!!!!!! 16 years of being illegal!
Anyway, I complained to one of the other A/G operators, who kind of shrugged it off...and I said I was packing it in as I wasn't going to do anything that was illegal and likely to confuse people.
All that was a few years back. And then, as now, no-one knew about their non-standard circuit joins if they hadn't been there before. Lovely friendly airfield...but when oh when are they going to get their act together?