Your Current medical if it's a HSE one should be fine. you could call the Madeira Road surgery in Parkstone and ask one of the GP's there for clarity.
Dr Des McCann is the main HSE man there. I get my medicals there each year for working at the chamber in Poole.
As far as I know a HSE diving medical is the same for everyone. The doctor can put restrictions on it if there are any fitness/ fatness issues.
Steve