The centre picture is of Moira Lister.
Moira Lister was born in Cape Town, South Africa on 6th August 1923. She started her acting career on the stage in South Africa. She appeared on the London stage at the age of 14 and started work in films in 1945. Always popular, she is usually seen in the role of a "posh" lady.

In 1954, Moira first teamed up with Tony Hancock in the second series of "Star Bill". She was brought into "Star Bill" to replace Hancock's previous lady foil of the first series, Geraldine McEwan. With considerable film experience behind her, Moira's strong personality proved her to be an ideal match for Hancock.

Denis Main Wilson, producer of both shows, asked Moira to join the cast for the first series of "Hancock's Half Hour". She left the cast at the end of the first series, to continue her film career.
http://www.tonyhancock.org.uk/moira.html