On 10 Aug 1982, the Times Published this engagement notice:

The engagement is announced between Robin Colville, son of the late Colonel Forester Britten and Mrs Zoe Britten, of St Denis, Bembridge, Isle of Wight, and Christine Esther, widow of Andrew John Coome of Pitt Corner, Love lane, Bembridge.

However the marriage could not be found on the FindMyPast BMD indices.

Now to find his birth.
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Might this be his birth:

Name: BRITTEN, Male (unnamed)
Registration District: Maidenhead
County: Berkshire
Year of Registration: 1932
Quarter of Registration: Apr-May-Jun
Mother's Maiden Name: James
Volume No: 2C
Page No: 693

If so he was a mere 50 years old at marriage.

Though there was also this earlier marriage:

Surname First name(s) Spouse District Vol Page
Marriages Sep 1958   (>99%)
BRITTEN Robin C COSTELLO Brixworth 3b 1293
COSTELLO Sylvia BRITTEN Brixworth 3b 1293

No Britten-Costello births found in England and Wales.
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From a web site about the Isle of Wight <http://www.iowrock.demon.co.uk/archive/iow_archive_1950s.html>;:

“Visits by Lonnie Donnegan, Tommy Steele and Terry Dene ignited Island teenagers when they played at the Ryde Commodore during 1957. The Commodore was owned by Colonel Britten of Island aeroplane manufacturers Britten Norman. The Colonel's son Robin Britten would later become manager for the Hollies and Gene Pitney's publicist. The Britten's held talent competitions at their two cinemas, the Ryde Commodre and the Medina Theatre in Newport.”
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Several people say that he was the younger brother of a John Britten.