Happy couple celebrating after impromptu proposal during One Day performance at Edinburgh theatre

Sophie Caws and Michael Winton, both 28, had travelled to the city after getting tickets to the One Day: The Musical, which made its stage debut in Edinburgh earlier this month.

The couple, from Bicester, had just finished watching the performance on Tuesday, March 17 when Michael spontaneously decided to pop the question to his partner of three-and-a-half years.

Michael said: “It was right after that ending song and the message of the story is to just seize everyday and I thought ‘just ask her to marry you’.”

Sophie Caws and Michael Winton, from Bicester, got engaged after Michael popped the question during a visit to Edinburgh to watch One Day: The Musical. | Supplied

He added: “I didn't plan it. The funny thing was that Sophie kept saying ‘you’re going to propose in Edinburgh’. But it was still a surprise for us both.”

Sophie said: “It was completely unplanned but I immediately knew my answer would be yes straight away, I didn’t even have to think about it.”

The story of One Day, based on the novel of the same name by David Nicholls, follows the 20-year friendship of Emma and Dexter after the pair meet at the University of Edinburgh in 1988.

Sophie pictured on the stage of the Royal Lyceum moments after Michael proposed. | Supplied

Sophie said: “I think that the message we both took from the show is that we don’t want to waste any time or the chance that we’ve got to be happy.”

Sophie also revealed that the theatre, cast and crew of the show have since reached out after their happy news.

She said: “[The theatre] was relentless in trying to get me a photo of our moment because we didn’t have any pictures.

Staff at The Royal Lyceum Theatre found a picture of the moment Michael proposed to Sophie at the side of the stage. | Royal Lyceum Theatre

“After that we had some lovely messages from the cast and that blew our minds completely. So a big thank you to the cast and crew of One Day and the staff at Lyceum because they have made this extra special.”

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Sophie added: “We’re not in wedding planning mode yet but I had actually bought one of the show merchandise notebooks, and I thought I could use that for wedding planning - it’s perfect.”

Speaking about the proposal, a representative for the theatre said: “Huge congratulations to the happy couple from The Lyceum. One Day: The Musical runs at The Royal Lyceum Edinburgh until 19 April - who knows what might happen next?”