Not sure if special circumstances apply here but if you were in the scheme then the answer should be YES you should have a preserved pension unless you transferred those rights into another scheme with another employer or transferred it to a section 32 policy.
You should have paperwork from when you left and get occasional statements/ notifications of rule changes etc from time to time, provided you have told them of your address changes.
It's important you contact the scheme now and give them your current details, otherwise they might never trace you to pay any pension.
souxie i was in the raf from 1973 till 1980, i did get a slip of something about a pension, just a printed couple of lines, raf innsworth used to be the place to contact if we had questions about pay and pensions,dont know if this station is still in exsistence,if you find out anything i would be glad to hear also about my pension thanks!!!
You both will have been in AFPS75.
You may be interested in this organisation that will not only be able to tell you where to start your search, but also campaigns on behalf of ex-Servicemen/women. http://www.forpen.org/index.php?location=3.1
Armed Forces pay and pensions administration has become tri-service now so I doubt that the PTC Unit at RAF Innsworth, Gloucester still deals with it