The final set of eight semi finalists perform live hoping to impress the judges and the viewers at home. Most of the acts on tonight's show improve on their performances from the auditions and it's the most open of all the semi finals. At the end of the show the phone lines are opened for tonight's public vote.

Britain's Got Talent Season 4 Episodes...

• s04e01 - Series 4, Auditions 1
• s04e02 - Series 4, Auditions 2
• s04e03 - Series 4, Auditions 3
• s04e04 - Series 4, Auditions 4
• s04e05 - Series 4, Auditions 5
• s04e06 - Series 4, Auditions 6
• s04e07 - Series 4, Auditions 7
• s04e08 - Series 4, Semi Finals 1
• s04e09 - Series 4, Semi Finals 1 (Results)
• s04e10 - Series 4, Semi Finals 2
• s04e11 - Series 4, Semi Finals 2 (Results)
• s04e12 - Series 4, Semi Finals 3
• s04e13 - Series 4, Semi Finals 3 (Results)
• s04e14 - Series 4, Semi Finals 4
• s04e15 - Series 4, Semi Finals 4 (Results)
• s04e16 - Series 4, Semi Finals 5
• s04e17 - Series 4, Semi Finals 5 (Results)
• s04e18 - Series 4, The Final

Britain's Got Talent Show Summary

Britain's Got Talent is a reality talent show hosted by Ant and Dec. Any sort of entertainment act is able to enter the competition and hopefully impress the judges and make it through to the final stages of the competition.

The series winner's prize is £100,000 and the chance to perform at the Royal Variety Show. The judges on the show are Simon Cowell, Amanda Holden, Alesha Dixon and David Walliams.