BAHS = British Airways Health Services
You'll need to go to Waterside for a cadet pilot medical some time after obtaining your Class 1. You can phone them to arrange. It's nothing to worry about though; if you can pass a Class 1 then you'll have no problem getting a BA medical.
I think private messages should be sent to
claudiaupear for those of you who want to join the FB group that she has set up.
Hope it's helpful.