Anjouan,
Just for clarification & without wishing to go off at a tangent to this thread.
Unless you retired from the UK military after 31st.March 1975 (I didn't) you don't receive a pension if you served less than 21 years, only a gratuity. Yes, really!
Pro-rata pensions were only introduced as a result of the introduction of the 1973 Social Security Act.
If there are any UK ex-military out there who wish to change this state of affairs then go to:
www.afpg.info/ with fraternal greetings,
ambi