"Salacious" dialogue had to be re-voiced in order to gain a "U" certificate from the BBFC. The most obvious example occurs when Philip Gilbert, playing a possibly gay patient, tells dentist Bob Monkhouse, "My trouble's all in my uppers. My bottom set's fine." The original line was "My bottom's fine."
As "Wilvram" suspected in 2018 Avril Angers plays a tea lady under the pseudonym "Rosie Lee."