The UK CAA is notorious for taking ages with responses. I would avoid. I've recently transfered my licences to Sweden and I always get a response within 24 hours. For the record, I don't speak Swedish. I'm not sure if this is just the case for Sweden, but there is no actual conversion per se - instead, you apply for a reduced course based on a foreign licence. I just did this to get my EASA ME IR based on my FAA SE IR.