I personally would keep your carbonation levels normal. I find that many of the traditional english hops they tend to be less bright and more herbal carbonation in general helps these hops pop a bit more inline with the aromatics you would expect in a ipa. Albeit more earthy herbal then citrus fruity of an american.
If it was a traditional british style such as mild, bitter, etc, I'd agree with the lower carb level. For an IPA, I'd stick with usual. 2.5 should be fine - maybe even a hair low - not sure offhand on the usual carb levels.
Since I keg, I’ll shoot for low 2’s then bump up if needed.
I am excited to taste this beer. I’m not a huge IPA drinker but this style piqued my interest.
Took me back to my early brew days when I wore out a couple of Papazian books.
I’ll post pics in a couple of weeks when ready.
Update- I ended up carbing to about 2.5 which turned out to be perfect because my kegerator is set at 35f, so I pour a glass and let it sit for a few minutes to warm up to 40s. By then the it's lost a tiny bit of carbonation but it tastes delicious and the aroma of fuggles and EKG start to pop.