"See above link for the difference between Ordinary, Special/Best and ESB Bitters"
That's where I see no separate British pale ale. I cannot recall where I saw (or think I did) an additional category, and so figured a British fellow would be a good way to get the scoop.
So I'm guessing those are the only types of British pales?
There are 2 typical types of American IPA. The standard and the West coast. I'm not precisely certain, but from testing with hop schedules it seems the standard IPA is more evenly hopped. I.e. 1 oz for bittering 1-2 oz for both flavor and aroma and stick to the limit of 70 IBU's, whereas with the West coast IPA's often greatly reduce the bittering addition, if not do away with it all together, and move in more flavor and aroma hops, and might look more like this:
0-1/2 oz bittering, and 2-4 oz for both flavor and aroma. West coast IPA's tend to not be bitter at all to me, though my pallet is not all that refined.
I just made an IPA in which I evenly hopped at 30, 20, 10, and 5 mins to get an extreme flavor profile, and brought it up to 102 IBU's, though I used about 1/3 top off water which should reduce the IBU's by 1/3 giving me ~67 IBU's. I find it somewhat strange in that it seems as though it needs a bit of bitter though.