Call the Midwife is to film an episode of the new series in apartheid-era South Africa, according to a report.

Quite how the East End of London-set drama will make the narrative jump to South Africa is a secret, but The Guardian reports that several members of the cast are due to fly to South Africa in April to film the story set in 1962.

The Guardian speculates that the nuns of Nonnatus House may be visiting a religious order in South Africa.

Despite the relocation to South Africa a spokesman for the series producers, Neal Street Productions, said it won’t cost any more than filming at the usual sets in London, Kent and Surrey. An episode of Call the Midwife costs around £1million.

The popular BBC1 drama about the nuns and midwives serving the working-class families of Poplar has gradually increased its viewing audience and series five concluded in early March with more than nine million viewers.

Call the Midwife series six will screen on BBC1 in early 2017.