You can try Muntons Pale Ale malt - it's a good solid base that's fairly clean and doesn't bringing oodles of that soft biscuit maltiness and complexity that you get with the Maris Otter malt. It's highly modified, so well suited to single infusions and has good diastatic power so you can add adjuncts to the mash also.
Being a pale malt rather than a lager/pilsner malt, you'll still get some malt backbone, just not so "in your face" as with the MO. However, since US 2 row is quite "dry/grainy", and you might want your IPA to be "just hops" then you could try using a good pilsner malt, which will contribute the least flavour from the malt. Personally, I'd go with the pale, since you need a little malt to stack the hops up against.
FWIW, all these malts are "2-row" - although barley strain does contribute something, the primary difference between the US and UK malts in how they are handled by the maltster.
I've brewed with US 2-row and Muntons, and to be honest, unless you're comparing them side by side, it's going to be difficult to discern any difference in something as hoppy as a IPA.
Here are some links comparing base malts:
- base malt experiment: tasting [Youtube]
- base malt experiment - blog entry comparing 5 different base malts