Call the Midwife spoilers follow.
Call the Midwife is just weeks away from airing its annual Christmas special, which will be swiftly followed up by its 12th series. And that series looks like it could feature a surprise cameo appearance.
Appearing on This Morning, actors Helen George and Megan Cusack were asked about the set visit that one of the faces of the Government's pandemic response team, former deputy chief medical officer Sir Jonathan Van-Tam, made in November.
When asked by Holly Willoughby if this mean he's popping up in the show itself, George tried to be vague about it.
"It's random," she said. "He came to set a few weeks ago because we were filming and he's become good friends with Judy Parfitt, who plays Sister Monica Joan.
"Judy sent him a couple of emails, just asking him a few questions and Jonathan Van-Tam apparently was running around the house going, 'Oh my god, Sister Monica Joan is emailing me!'.
"[He] loves the show and came to set to see us last week and I think he might be coming back to do… I mean we are talking about this as if it's going to happen!"
"He was gorgeous, he was lovely and so happy to be there," Cusack added.
Van-Tam has previously described Call the Midwife as "not just another medical drama, but a really impactful social commentary on healthcare issues of the day". He added that he was "starstruck" to meet the cast.
One thing we know is happening in Call the Midwife series 12 is that George's character Trixie Franklin will be tying the knot with Olly Rix's Matthew Aylward, following their relationship blossoming slowly across the last two series.
The series will also focus on the legalisation of abortion in the UK, while other issues which also had an impact on women's lives, such as the introduction of the pill and more open discussion of domestic violence, will also be explored.
Call the Midwife airs on BBC One, while This Morning airs on ITV.
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