The UK CAA have an archaic system where an initial Class 1 applicant had to make the trek to the Aeromedical Centre (AMC) in Gatwick to go from room to room to undergo a battery of tests. Great fun if you lived in Scotland.
You have been out of the UK too long QFF.
The UK CAA stopped being the norm for issuing the initial class 1 medical a number of years ago.
IIRC under EASA it was not deemed appropriate for the Member Nations' National Aviation Authoritiy to be both the Regulator of a service and the provider of that same service.
It is now the responsibility of AMCs independent of the UK CAA to issue the initial class 1 medical.
https://www.caa.co.uk/Commercial-ind...l-certificate/
NATS initially were offering the service at their centre in Prestwick thereby saving applicants the journey to Gatwick but are no longer doing so.
Perhaps it is time for you to return to Scotland and say hello to some old faces.
I'm sure you would get a warm welcome ( even if it's "pure freezin' or baltic man oot-side" )