Charlotte Ritchie says some people love Call the Midwife so much they don’t seem to realise it’s not real life – especially in the case of Barbara Gilbert and Tom Hereward tying the knot.

Aml Ameen, Jasmine Blackborow, Douglas Hodge, Tom Hughes, Johnny Harris, Gerald Kyd and Charlotte Ritchie have also joined the cast. A plot synopsis reads: “In the early 1990s, Her Majesty’s ...