You may still be able to be exempt the initial issue Class 1 bull****. I was for my UK ATPL in '99. Contact medical branch to confirm.
I had to bring with me:
* a current ICAO class one (mine was from Oz),
* an opthalmologist's report (not optometrist)
* Chest xray
* blood test
* Some other things too, as I recall but those were the biggies.
If this routine is still available it can save you a good few quid and a day at Gatwick getting probed. Medical branch will be able to give you the details.
NB: I got my DAME in Oz to give me a referral for these things so it was done on Medicare.