Tony Beynon? Let's see...
He upset a lot of instructors, PPLs, and private owners, but it's all hearsay, so I'll leave them to tell you about it. Many of them are at Sleap, Hawarden, Shobdon, or Liverpool, and wished he'd leave as otherwise they love flying from Welshpool.
But here's what I know personally...
I was having a really hard time learning to fly, and not getting on with my instructor. did he care? I doubt he even noticed. But he was only the owner after all...
Someone else had problems with the same instructor. this guy phoned me, wrote to Tony, wrote to the CAA. As far as I know, nothing was ever done, and this guy gave up flying.
One day I came in with a passenger to tell him I'd just done the "A" check, and not a single light was working. In front of my passenger, he glared at me. "Well, what's the problem; you're not flying at night", was all he said. My passenger wasn't impressed.
For various reasons, Tony ended up doing my check-out on the General Avia F22A. He deliberately set out to scare me, put me down, and similar. After an hour I took my hands off the controls and said: "OK Tony, you've made your point. I can't fly this aeroplane; I need more time. But I'm too stressed out to fly any more, so you take us back before I do something really stupid and kill us both". He roared with laughter, and actually we got on OK after that - don't ask me why.
WWW, he may be a fair boss, though many disagree. But I can't think of much else good to say about him.