I do get the impression that he was reasonably ubiquitous in UK media, but in what way did he most prominently stand out over there in the last couple decades?
Much like Nagisa Oshima (ironically enough), he had a great many irons in the British media fire - he was an extremely high-profile restaurant critic for the Sunday Times
, had various other newspaper columns, and was rarely out of the public eye when it came to appearances on chat shows and game shows, incredibly annoying insurance commercials, etc.
It's probably no exaggeration to say that as far as the UK was concerned he was (until yesterday) the most famous living British film director - even the likes of Ken Russell fell into comparative obscurity in his last couple of decades, but Winner actually became more
famous after he abandoned filmmaking in 1997 (with Parting Shots
, reputedly one of the worst films ever made, although he'd have to go a long way to top - or bottom - 1990's Bullseye
Had I not been discussing The Big Sleep (the book and Hawks version) with somebody the week before Winner's death & having his remake come up from the person I was talking to, I honestly wouldn't have even known who he was.
He was actually quite an interesting director half a century ago, largely for the likes of West 11
(1963) and his films with Oliver Reed (The System, The Jokers, I'll Never Forget Whats'is'name
), but from the mid-1970s onwards he was more or less synonymous with terrible films.