http://www.srg.caa.co.uk/pld/med/med_exam_list.asp has a list of AME's with addresses, phone numbers etc.
It also states:
Medical Examiners with numbers in the series 10,000 can examine to class 1 and class 2 standards.
Medical Examiners with numbers in the series 20,000 can examine to class 2 standards.
TAFO