Are the middle couple guests at a wedding, because no British upper class nuptials would have groom or male guests in lounge not morning suits? If it was wartime maybe, but that photo looks as if it is from the late 1950's early 1960's to me.
The top photo is a wartime photo, I think. Apart from the groom concerned being a uniformed RAF officer as the Duke of Kent was, I can't see any resemblance to any male member of the BRF.
In the last photo the groom is in morning dress and has the look of a Lascelles to me. The bride is in a gown which appears to be late 1940's. When did Princess Mary's (Countess Lascelles) younger son marry? Otherwise, the two wedding photos may be weddings at which a Royal or two was present and that's the connection. I really can't see any obvious Royal link at all, sorry.