Call the Midwife set for five series
'Call the Midwife' bosses are pushing for the BBC to sign the show for five more years
'Call the Midwife' bosses are hopeful the show can run for at least five more years.
The 1950s drama series - which stars Miranda Hart, Jessica Raine, Pam Ferris and Jenny Agutter - has been the BBC's most successful drama since 2001, and with a second series already commissioned, talks have now begin to keep the programme running beyond 2014.
A source told the Daily Mail newspaper: "There hasn't been anything like this at the BBC for many years.
"We're going to great lengths to ensure we have options on the cast to return for a number of future series.
"We want this to become a big Sunday night franchise for BBC1 in the same way 'Downton Abbey' is for ITV1.
"Miranda is one of the key people we need to secure, but we are hopeful of doing so."
The season one finale of 'Call the Midwife' attracted 9.2 million viewers so BBC bosses were delighted when a second series of eight episodes was confirmed.
BBC One controller Danny Cohen said: "It's been wonderful to see viewers respond so warmly - and in such large numbers - to this world of babies, nuns and extraordinary women."