The BBC proms program does list it as being played Sep 11 1976: https://www.bbc.co.uk/events/ecv9rz
I can only find partial recordings of the 1976 Proms online, none of which contain Williamson's orchestral suite from Our Man In Havana, but there are recordings of the suite by the Iceland Symphony Orchestra and the Tasmanian Symphony Orchestra: https://www.youtube.com/playlist?list=OLAK5uy_lSXIzDvMzbsfKMP5T4gzZeWzM5vYeBqoY https://www.youtube.com/playlist?list=OLAK5uy_n7jDeydP9Z9FTTRKW42prSoG7828Ub78E
"I can't find it anywhereI've now solved this, it was from "Our Man In Havana". Last night at the proms by the BBC symphony Orchestra 1976.
eccoteLW
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