BJCP 14A
A hoppy, moderately strong pale ale that features characteristics consistent with the use of English malt, hops and yeast. Has less hop character and a more pronounced malt flavor than American versions.
A pale ale brewed to an increased gravity and hop rate. Modern versions of English IPAs generally pale in comparison (pun intended) to their ancestors. The term "IPA" is loosely applied in commercial English beers today, and has been (incorrectly) used in beers below 4% ABV. Generally will have more finish hops and less fruitiness and/or caramel than English pale ales and bitters. Fresher versions will obviously have a more significant finishing hop character.
Meantime India Pale Ale, Freeminer Trafalgar IPA, Fuller's IPA, Ridgeway Bad Elf, Summit India Pale Ale, Samuel Smith's India Ale, Hampshire Pride of Romsey IPA, Burton Bridge Empire IPA,Middle Ages ImPailed Ale, Goose Island IPA, Brooklyn East India Pale Ale
You can view the complete style details on the BJCP website. The 2008 style guide is obsolete but there is a similar 2015 style that you can view below...
OG: 1.050-1.075
FG: 1.010-1.018
IBU: 40-60
SRM: 8.0-14.0
ABV: 5.0-7.5%