 Michael Trubshawe (qv)s character is addressed by  Robert Morley (I) (qv) as "Niven". Michael Trubshawe and  David Niven (I) (qv) were very close friends from when they served  in the military garrison at Malta together and David Niven would  call uncredited characters in his films "Trubshawe". So this was  Trubshawes way of returning the compliment.