I think that's a very high starting gravity for an English IPA, which is why the FG is also high. 1.050-1.055 would be much more common in the UK, and things like Green King IPA (which is arguably merely a hoppy bitter) are more like 1.040. I've never seen an British brewed commercial English IPA over about 6% ABV*. 1.075 is right at the high end even for American IPA. IMO it's more in IIPA territory.
IPA would usually be brewed in the UK with some sugar as well, at maybe 5% of the gravity points, which will help bring down the FG. If you really want to bring the FG down, replace half the caramel malt with a dark invert sugar, either Lyle's Golden Syrup or make your own medium to dark invert sugar.
*in my opinion as a Brit and former CAMRA member, the 2008 BJCP guidelines table of gravities are wrong on this style, and refer to some mythical historic style that was barely, if ever, brewed, rather than actual English IPA that you can buy. A few breweries in the UK may now be brewing stronger English IPAs, but that's probably mostly as a response to the US craft beer scene, not a link to English IPA as it was say 10 years ago.