WATCH: Dancing grandparents from Wolverhampton wow Britain's Got Talent judges

David and Marg Thompson have been dancing ballroom and Latin together for almost three years - but never in their wildest dreams did they think they would appear on a huge stage being broadcast to millions of people all over the UK.

WATCH Dave and Marg on Britain's Got Talent:

Nor could they have imagined receiving a standing ovation from the crowd and four 'yes' votes from the judges, sending them soaring into the next round of the competition.

The married couple live in Willenhall and are well-known as market traders across the Black Country.

But they were in a whole other world on Saturday night after receiving a standing ovation and glowing reports from the four famous Britain's Got Talent judges; Simon Cowell, Alesha Dixon, Amanda Holden and David Walliams.

David, age 61, who was born in Bilston, said: "When they asked me to do it, I thought someone was pulling my leg at first. Not being funny. I said no, I wouldn't do it.

"But they contacted me again and asked me to consider it. I spoke to my children and they said we should go for it - it would be an experience.

"We have danced in competitions before but being in front of the judges and an audience, I just went blank. I can't even remember any of the comments! It was just an incredible experience."

David and Marg, who is 59, have been dancing with Wolverhampton's Zig Zag Dance Factory for nearly three years - but David needed a bit of persuading when they first started.

He added: "I've done sport for 18 years and used to do judo with Wolverhampton Judo Club. But my wife always wanted to dance. So my daughter bought us five lessons for Christmas five years ago. It took her 12 months to get me to come along though.

"So we did it and I said I would never do it again. But then 12 months later my wife was unwell, and it was hard to get her out of the house. So I thought the only way to help was to get her dancing. That was two and a half years ago and I've loved it ever since."

The pair's routine was choreographed by Warren Bullock, a former international ballroom and Latin champion, of Zig Zag dance.

A perfect mix of comedy, energy and sparkle - it saw Dave and Marg perform a cha cha cha and jive mix to Proud Mary by Tina Turner. Even their costumes had been considered carefully - with both of them walking on stage wearing simple market trader outfits, before revealing glamorous Latin suits and dresses underneath.

The couple have received an incredible amount of support from their friends and family, especially their two daughters, son, and three grandchildren.

David said: "It was nerve-wracking. I can't remember it really, we had never even been on a stage before.

"But everybody was just so lovely on the day. After we had been on, Ant and Dec were there and Ant put his arm round Marg and said 'that was absolutely brilliant'. We even went on ITV2 for Britain's Got More Talent with Stephen Mulhern. It was a full day of filming."

Their teacher Warren, who was also the star of Channel 5's Baby Ballroom TV series, added: "When we were asked by Britain’s Got Talent if we had a unique dance couple that were grandparents, we suggested Dave and Marg as we thought the producers would love them.

"They are passionate dancers from the Black Country but they aren't your typical ballroom dancers at all – we hope this shows that dancing is for everyone, no matter what age they are or what background they come from.

"We are extremely proud of how well they did. Getting 4 yes's and a standing ovation was an amazing moment.

"Simon Cowell said that it wasn't exactly Swan Lake but that it was very entertaining and he loved it."