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BLOOD: Today’s opportunities to donate blood are outside Hyde Park Chapel in South Kensington and Minster Church Hall in Croydon. Free, see site for terms and conditions
NEW ART: London-based art practice United Visual Artists' Momentum exhibition opens at Barbican today, using the mediums of light, sound and movement to guide us through a sensory journey. Read our interview with them here. Free, just turn up, until 1 June
SOUTHBANK CENTRE TOUR: The first of several one hour tours of Southbank Centre, taking in the history and architecture. £8.50/£7.50+bf, prebook, 2pm
BOXPARK PARTY: Shorebitch are holding a pre-Valentine's Day party with music from DJ Luck & MC Neat. Free, just turn up, 6pm
WATER TALK: Learn about the history of London’s water supplies from 1827-2012 from Emma M Jones, author of Parched City: A History of London's Public and Private Drinking Water £5+bf, prebook, 6pm
PUBLIC HEALTH: This talk at Kensington Central Library focuses on the health of the Kensington area over the past 150 years, using resources from Kensington Central Library and digital archive London's Pulse. Free, prebook, 6pm
PRIVATE VIEWING: Great Western Studios hosts its latest Inside Design event, allowing brothers Patrick and Tristram Fetherstonhaugh to provide insight into their creative work. Free, prebook, 6pm
PUBLIC DEBATE: Following on from the Leveson inquiry, this debate at London School of Economics looks at whether the ethics of the media are suitable for today's society. Free, just turn up (arrive early to avoid disappointment), 6.30pm
SECRET LONDON: Learn the secrets of Oxford Circus, including secret tunnels and a toilet that became a bar, at Mr Gill’s Precious Ornaments, a walk by Richard Watkins of Footprints of London. £10/£7.50+bf, prebook, 6.30pm
FOLK MUSIC: Folk Rising gives a new generation of musicians a platform to improvise new styles and ideas. Features Will Varley and The Edmonsons, at Cecil Sharp House. £5, prebook, 7.30pm
CANNIBALS: South East London Folklore Society's February event takes place at The Old King's Head and uses poetry, stories and songs to explore The Custom of The Sea, or the practice of survival cannibalism. Free, prebook, £2.50/£1.50, 8pm
Bermondsey start-up Pact Coffee is on a mission to get London drinking better, fresher coffee. Get your first 250g bag of hand-roasted coffee delivered to your home or office for only £1 with free P&P. Just use the code londonist14 at checkout. For more info and T&Cs click here.
Good Cause of the Day
Prebook now: On 26 February, Backyard Bar in Bethnal Green hosts a fundraising event, Live At The Catwalk, featuring stand-up comedy, live music, a catwalk and a raffle with prizes donated by the likes of Ryan Giggs and N-Dubz star Dappy. Tickets are only £7 each, and all money raised goes to The Prince's Trust, which helps disadvantaged people throughout the UK. Book your ticket here.
London Connection Puzzle
Your clues so far have been ST PETER-AD-VINCULA and THE HOUSE OF LORDS. Today's addition is THE CUTTY SARK. Think you've spotted the theme that connects these three? Email email@example.com with your solution. (If you're reading this in the email newsletter, please check the live site first, to make sure no one's beaten you to it.) Final clue tomorrow.
From the Archive
A year ago today we were scratching our heads over the following puzzle: which route around the Underground takes in each line for just one stop? Luckily our friend John Wilkes shared the solution with us, or else we would have got nothing else done this past year.
It's 'Bridge Week' on Londoddities. Today's entry is Clattern Bridge, a Grade I-listed structure that crosses the River Hogsmill in Kingston. It's the oldest intact bridge in Greater London, with references going back to 1293 when it was known as Clateryngbrugge. The name probably refers to the sound of horses clattering over the bridge. In 1895 a triumphal arch was erected on the span to welcome Princess Helene of Orléans on the occasion of her wedding to the Duke of Aosta.