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Things to do today:
BRITISHNESS: Accompanying the exhibition Strange and Familiar, this Barbican interactive installation explores what it means to be British. Sampling Britishness Today looks at questions the idea of identity, manipulating the portrait and voice of visitors in a British "average". Free, just turn up, 10am
ROALD DAHL'S WORLD: Discover everything about The Wondercrump World Of Roald Dahl at this Southbank Centre exhibition. Step into interactive installations, meet familiar characters and giggle your way round this magical journey. £10/£8, prebook, 10am
TO BE OR NOT TO BE: Guildhall Library invites anyone with a favourite piece of Shakespeare's work to read, recite or sing at this afternoon's Speeches, Soliloquies and Songs. Drop by to listen or volunteer to perform your favourite bit of the Bard. Free, contact Guildhall to volunteer, 10am-12pm and 1.30pm-3.30pm
FREE LUNCHTIME MUSIC: Head to St-Martin-in-the-Fields in the northeast corner of Trafalgar Square to hear the talented Chagall Quartet play pieces from Bridge and Brahms. Free, suggested donation £3.50, just turn up, 12.45pm
BIG OCEANS: The UK is responsible for 6.8 million sq km of ocean, so what are we doing to protect it? Head to ZSL London Zoo to discover how the country plans to become a world leader in marine stewardship. Free, just turn up, 6pm
BOOK CLUB: Bloomsbury Institute presents its Book Club with Guardian journalist and novelist, Erwin James. He'll be discussing his latest work, the memoir Redeemable, in conversation with Duncan Campbell. £21.49 (including a copy of the book), prebook, 6.30pm
YOU ARE WHAT YOU EAT: Take an after-hours trip to Borough Market and join a tasty debate. Borough Talks brings a food fact-packed panel together, including chef James Lowe and food writer, Bee Wilson, to discuss what shapes our meal choices. £15, prebook, 7pm
MILTON JONES: TV favourite and all-round hilarity king, Milton Jones, takes the chair at The Backyard Comedy Club tonight. Host, Joel Sanders, will be probing the depths of Milton's mind and you'll have a chance to throw out your own questions too. £10, prebook, 8pm
Good cause of the day
Giving money has never been so funny at tonight's Laughing Point comedy night, supporting Centrepoint. Join Adam Buxton, who's bringing his mad blend of film, comedy and music to the Hippodrome Theatre to raise cash for the city's young homeless people. Expect even more of the capital's best comedic talents and one huge side-splitting show. £15, prebook, 7.30pm, 10 May 2016