Who are the Britain's Got Talent 2015 semi-finalists?

John, Jo, Stuart, Barney and Matt are a five-piece tap dancing group from various locations across the UK. David had a suggestion for helping him make his decision: topless tap dancing.

Billy and Emily England

Very much a 'do not try this at home' act, brother and sister act Billy and Emily showed off their fancy moves on skates, including Emily's head being swung millimetres from the stage floor. They were branded "fearless" after a standing ovation from the judges.

Bonetics

You need to see this to believe it. Junior, 17, is a dancer-come-contortionist who co-host Ant is pretty sure is made of rubber.

Dylan Byrd

Alesha found herself hugely unpopular with the crowd and her fellow judges after she buzzed 17-year-old Dylan. He'd left Ireland for the first time ever to audition and showed off some seriously fierce moves to Jessie J's Bang Bang.

Groove Thing

I defy you not to smile while watching Groove thing, a 12-piece group of dancers from Wales whose ages range from 7-11. They've got the outfits, they've got the moves, and they got four yeses from the judges.

IMD Legion

Last year's young BGT dance duo Lauren and Terrell return as part of a 26-piece dance troupe. They earned four yeses and Simon labelled it a gold medal performance.

Jonathan Lutwyche

Amanda told Jonathan that she'd “honestly never seen anything so beautiful and heartfelt" after Jonathan performed a gymnastic-meets-ballet contemporary dance. Jonathan hails from Gibraltar and is just fifteen.

Luca Calo

Luca's audition got off to a rocky start with some less than tuneful singing, but when he suddenly started to throw some shapes, the mood completely changed, albeit without the backing of Simon who admitted: "I'm not sure what just happened."

OK Worldwide

Three of the four dancers from this funky dance troupe hail from Romania but now reside in London. From free-running to breakdance to backflips, the group earned an easy pass into the next round of the competition.

Old Men Grooving

A stand-out moment from this year's auditions, Old Men Grooving stunned the judges when they suddenly started breakdancing and hip hopping their way around the stage. Simon told them: “there are a lot of dancers I get bored by, but I could watch you all night – age is nothing but a number.”

Ruby Red Performers

The Ruby Red Performers are a 12-piece burlesque dance group from small seaside town Withernsea who left the judges with something to talk about after their routine saw them lose more and more items of clothing...

U.D.I

U.D.I is a light performance group from Siberia, who amazed the judges with their good vs evil-themed routine. The group teach disabled and orphaned children to dance back home. Amanda told them, “I think it was one of the best things I have seen in my whole life”.

NEXT: DOG ACTS