Ginseng
I agree I should have said that total length of Service is actually more important than age on exit. Its just that most join from school/higher education and thus age on exit tends to equate to length of Service.
I was pleased to hear that University Cadet Service counts (from age 18) mainly it would seem because we were paying National Insurance contributions! Now about that missing 6 months of contributions before I hit 18 do you think I can get them back