According to Wikipedia:
Founded in 1985, the orchestra has since performed in many venues worldwide, including New York's Carnegie Hall (2009, 2012), the Sydney Opera House (2012), London's Royal Albert Hall (2008, 2012) and Glastonbury Festival. TV appearances have included: Jools Holland's Hootenanny, BBC Radio 2 Electric Proms, Blue Peter, The Slammer, Richard & Judy, This Morning and Skins.The band was formed "to challenge people’s expectations of the ukulele," according to Uke Richie Williams.
I saw the orchestra perform at the Curtis Phillips Center on the University of Florida campus in 2015. I thoroughly enjoyed their performance!
Here is one of my favorites of theirs, "The Good, The Bad and The Ugly"
Check the Ukulele Orchestra of Great Britain website for their performance schedule and more.