Just been through this process and have a warning for you. Allow 6-12 months to get a reply. They do not answer the telephone, written requests only. They say they will reply within (I think) 20 days. After two months they sent me a letter asking for £96 to answer a question and then I waited for another 6 weeks for that reply. I then asked for a summary for pension sharing which cost another £120 and took 2 months. All this time I called and called and called. The helpdesk!!!!! will not put you through and only send the department an e-mail saying you have called. They get 10 days to reply to the e-mail, but never do. It is frustrating beyond belief, my solicitor told me to do it because she would charge £15 for each call and letter and it would have cost hundreds and hundreds of pounds. Make sure you read the helpful pensions advice on the MOD website, the helpdesk kept telling me everything I needed to know was there.....
Final advice.............
