A west London mansion is one of the stars of Downton Abbey creator Julian Fellowes' new TV drama.
The dance scenes for Frank Gresham's birthday party were shot inside the Grade-I listed property, in Isleworth , at a fictional Greshambury Park.
If you didn't recognise the building on the show that might be because the exterior shots were actually filmed at Wickham Park in Buckinghamshire.
As executive producer Mark Redhead said: "You stitch together lots of different interiors and exteriors to create what you hope is a world the audience can navigate their way around."
Doctor Thorne stars Tom Hollander, who can also be seen in the BBC's Sunday night drama The Night Manager, in the title role.
It follows his attempts to secure the romantic and financial fortunes of his niece, Mary (Stefanie Martini).
The drama was also filmed at Tyntesfield near Bristol and in Lacock, which doubled as the village of Greshambury, during 2015.
Mr Hollander said: "It was a very lovely autumnal tour around some of the most beautiful houses in the country. That was a very special thing."
It is not the first time Osterley Park House has made it on to the screen, big and small. It was most famously used for the interior shots of Batman's home Wayne Manor in the 2012 film The Dark Knight Rises.
Judith Evans, house steward of the National Trust property, was on hand to make sure everything went smoothly during filming for Doctor Thorne.
"We had 50 crew members, 30 extras and 15 cast on site, which is a lot of people in one space," she said.
"We make sure that our collections - including floors and ceilings - are protected, while also meeting the needs of the film crew so they can actually get the scene done and dusted in the time frame they need.
"For Dr Thorne they were using real candles, so we needed to protect the floors using a clear plastic that we put on the ground under the candelabra to catch any drips.
"Filming is great news for our conservation work as every film or TV drama shot on our land and in our houses and gardens helps generate income, which we put back into caring for these special places."
Doctor Thorne continues on Sunday, March 13 at 9pm on ITV.