Hello Dave,
Have you been officially denied your medical? If not, get it somewhere else. You then swap it for the UK medical.
This is done pretty often, cheap and quick, as travel + medical is usually much cheaper than a Gatwick medical. All info on Pprune.
If you have been denied, you may need to do your licence elsewhere, which is not really a big deal (many countries do it all in English).
good luck! IP