WARNING: This article contains spoilers from Antiques Roadshow.

An expert labelled a collection of Royal replica doll's house plates as "marvellous", before sharing their staggering value.

Expert Fergus Gambon was on hand to meet with a guest and her beautiful doll's house dinner set which he believed were "exquisite".

As he questioned how they came to be hers, she shared: "In 1968, my mother was going to go to Hampton Court Palace to buy a doll house because she was a collector."

The guest then revealed that her mother eventually sold the doll's house but kept the dinner set as she was told that it was "identical" to the one in Queen Mary's doll's house.

Gambon replied: "Wow, that's wonderful. But Queen Mary's doll's house, which most of us know about, and it was completed in 1924, and it was designed by Sir Edwin Lutyens, one of the greatest English architects.

"It's a national treasure and it's on display at Windsor Castle. You've seen it, I presume."

As the guest admitted that she had only ever seen the Royal doll's house in a book, Gambon stated: "Wow you should go and see it and see the sister service."

He continued: "We know it's from Queen Mary's doll's house, because it actually has Queen Mary's cipher written on the plate in gold. That is 22 carat gold.

"And on the back, in absolute minute lettering, it says 'Made by Mintons Ltd.'

"That's incredible, so exactly the same service as this.

"Whether this is a full set I'm not sure but there are 18 plates, I'm sure that's the right number, there's three of these sauce terrines, tiny individually modelled lids.

"There's only one sauce boat but you've got oval platters of various sizes."

The expert shared that this would have been a duplicate made at the same time as Queen Mary's had been with only about four sets made in total.

"The quality is incredible, because when you're making a piece of porcelain, it's much more difficult to make it in small size than full size," he remarked.

"The detail and the gilding is absolutely marvellous and that's what you'd expect from Queen Mary's doll's house.

"Because as you probably know, a large number of contemporary artists were asked to contribute paintings and writers wrote miniature books for the library, and it was a massive effort by the nation to provide this wonderful house. So it's an important thing."

Gambon picked up one of the porcelain plates and jokingly asked the surrounding audience what they believed it was worth.

Someone in the audience said £100 and to this, the expert exclaimed: "£100! For that? Must be mad."

He went on to say: "Well when I tell you that in a sale a few years ago, one of these little terrines with its tiny little cover, made £1,200."

The major figure made the guest laugh before she questioned: "Really?"

With a smile, Gambon replied: In an unexpected moment, he then concluded: "I'm going to say that this service is worth £7,000 to £10,000."

The guest automatically gasped, before smiling as she made an unusual wheezing noise.

She beamed: "I'm speechless. Really? It's been in a drawer ever since my mother died.

"I can hear here my mother up there going 'wahoo!'"

Antiques Roadshow is available to watch on BBC One and BBC iPlayer.