I would say Audrey from To the Manor born but DH (not sure about the D at the moment) reckonsit is more a mix of Mary doll (Rab c Nesbitts wife and Mrs Mack ( from take the High Road)
Joanna Lumley as she is now enjoying all her Worldwide travel and when she was in Ad-Fab reminds me of my foot loose and fancy free time in the late 60's with all the hair and short skirts. Galen Gibbs is just something else isn't he (silent swoon)