The CAA requirements for medical exams are here:
http://www.caa.co.uk/default.aspx?ca...68&groupid=211
A bit of imagination should make it clear what you will be required to do. It's frankly up to the individual Doctor what technique they use to conduct the exam as long as the requirements are fulfilled. If you still have questions:
CAA Safety Regulation Group
Aviation House
Gatwick Airport South
West Sussex RH6 0YR
For enquiries:
Telephone Call Centre +44 1293 573700