France / UK IFR but NOT in controlled airspace.
The difference being if you're resident outside the EU, the French will issue you a French licence [JAA] based on your foreign licence IF you want to apply for one, whereas if you're resident in the UK or the EU they won't. You have to submit proof that you are legally resident outside the EU. If you are a brit legally resident OUTSIDE the EU then they will issue you a licence too. Not sure if the Channel Islands count as EU, but in the French eyes they probably count as French anyway
Drop them an email, I was impressed at the speed of their response.
Cheers
EA