Greg - not really - Bristol have it pretty much sewn up, except that there are some questions that will not be asked that they haven't caught up with yet! Especially on the helicopter side!
We recommend aviationexam for our students who are taking their exams in their own country. This of course makes it doubly difficult for people whose native language is not English and who are trying to make sense of the awful language in the questions!
Richie - this is where the difference is - the questons may look identical, but Bristol's have been modified to match the UK type of question, i.e with corrected answers and English.
Phil