I stand to be corrected but once I saw that flt lt was correct but captain was not. Possibly because a retired captain from the Blues and Royals might be confused with a real captain
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The same source had flt lt RAF to take precedence after Lt RN but ahead of Mr rtd.
BTW, when working with green as CS they were totally confused by our status which was as RAFR and not RAF Retd. We had to keep telling them we were commissioned into the RAFR and had the scrolls to prove it.