Someone has sold you a fairytale about IPA production because they don't like the style.
(edit - you'll notice at those shops they are selling all sorts of styles as concentrates, including "Polish hopped beer" - https://browin.com/shop/beer-brewing/coopers-concentrates )
Not something I'm interested in. But it certainly doesn't support your weird assertion that IPAs in particular are all made from concentrate.
I think you have a number of things mixed up in your head here.
Additionally the UK also makes very high quality malt including malt made from heritage grains and floor malted, which I've had in IPA form.
There are many decent IPAs available in the UK, such as American style ones comparable to beers such Heady Topper etc. Or more traditional ones such as made by Fullers etc.
Check out breweries such as Thornbridge / Verdant / Polly's / Cloudwater / Siren / DEYA etc.
Very curious as to what IPAs you've had.
Go for cask real-ales on the big pumps rather than craft beers off the keg taps, and you're drinking old-school British beers brewed in the way they have been brewed for hundreds of years. Some of them will be IPAs. Most of them will be in the range of 3-6% alcohol.
They don't tend to be as massively hopped and flavoured as the newer 'craft' styles, they are less fizzy (natural carbonation only, rather than forced keg carbonation) and might be kinder to your head as a result.
More on the process here https://www.scientificamerican.com/article/concentrated-beer...
