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Being a French horn player myself, I know that Ms. Kendall absolutely did not play. Her mouth and her fingering is all wrong - not to mention the lipstick. I do love that scene though! (Don't know who really did the playing)
I remember reading somewhere that the trumpet solo was played by Kenny Baker, who was in Ted Heath's band, as well as leading his own group Baker's Dozen. The trumpeter in the film is an actor, who's name eludes me at this time, but usually played small roles usually either a gangster or a GI. He is in the Ealing Film "The Sea Shall Not Have Them".
Kay Kendall's trumpet playing was dubbed by Kenny Baker. Kenny's Baker's Dozen jazz group toured throughout the UK until very recently. His group is one of Britain's most well known jazz ensembles. The group featured weekly on BBC radio for many years in the 1950s and 1960s.
Hope this clears this up for you.
Regards, Alastair Fyfe, Sydney.