Jason
If your father was in the RAF you should be able to obtain his service records from the RAF for a fee. Have a look at the Veterans web site for more details of where to write to etc. It would help if you knew his service number and you will need a copy of the death certificate.

I have just found the letter I received when I obtained my fathers record

Write to RAF Disclosures, Room 6 Trenchard Hall, Royal Air Force Cranwell Sleaford NG34 8HB

Hope that this helps