David Walliams goes UNDERCOVER! | Episode 8 | BGT: Unseen

We saved the best 'til last! Here's Episode 8 of BGT: Unseen featuring hilarious comedian Cubby, the RAF Air Cadets National Choir and Ember Trio, a classical trio like you've never heard before!

And, of course, the judges are up to their usual mischief...

See more from Britain's Got Talent at http://itv.com/talent

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