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Have always had the opinion that the real player was Harry James but unless Kay Kendall had found a way to play notes whilst breathing in then I am sure it was dubbed.
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.