It included Delius 'Paris' I think,between the Pomp and Circumstance and the Sea Songs.
That has, of course, sent me scrabbling to look through my old Proms Prospectuses
. That one looks like the 1965 Last Night, Smittims, which went:
Smetana: Bartered Bride Overture
Verdi: 'O don fatale' from Don Carlos
Rachmaninov: Rhapsody on theme of Paganini
Britten: Variations and Fugue on a Theme of Purcell
Elgar: Pomp and Circumstance No 1
Delius: Paris
and then the Sea Songs, Rule Britannia, Jerusalem etc
(Josephine Veasey, Ann Schein)
The 1966 one (maybe you went to both?) was:
Rossini: Overture, Journey to Rheims
Prokofiev: Piano Concerto No 3 (Martha Argerich, no less, playing what I always think of as 'her' concerto)
Stravinsky: Firebird Suite (it doesn't say which, the shorter one presumably)
Elgar: P and C No 1
Holst: Beni Mora
and then Sea Songs etc.
Monica Sinclair that year (now there was a true contralto)