If you married after you left the RAF, your wife's pension would be based on 50% your pension entitlement for service after April 1978 (see para 2.2 of attached). You can ask for an up to date forecast by writing to Veterans UK giving them your Service details and the date of your marriage. As Wrathmonk says, it is good to get things confirmed in writing.
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37284_MMP114_ Family Benefits.pdf