Hi,
I believe that there was at least one Squadron of Buffalos stationed in Burma during the early stages of the war, and there have been some stories that a few of them may have been evacuated to India after the fall of Burma, but I haven't been able to find anything more about those planes.
Additionally, it is known that several Buffalos were either evacuated (or in some cases possibly diverted) to Australia after the fall of Malaya/Singapore and The Dutch East Indies and many of those planes ended up serving in mainland Australian service for a bit and at least one is known to have been seen in USAAF livery.
And finally, some Buffalos from an earlier Belgian order taken over by the UK were known to have served a a number of FAA squadrons, in small numbers (such as on Crete in the Mediterranean)
Don't know if that helps any.
Pat