When I started drinking, about half a century ago, I don't think any of those beers were easily available. The first I remember was Hopback Summer Lightning, which was stocked by most Wetherspoons, and hence was easy to find.
The American IPAs started appearing after home brewing became legal there, allowing micro-breweries and then small breweries to challenge the big brewers. The latter mostly produced what we would call lagers, and of the same sort of quality as the bitter the UK big brewers made fifty years ago.