Londinium, directed by Andrew Griffiths, is one of London's most versatile chamber choirs, particularly noted for vibrant performances of a cappella repertoire. Founded in 2005, the choir has established a strong reputation for diverse, imaginative and eclectic programming, often bringing together works written many centuries apart to thrilling effect. Its concerts have won consistent praise from critics; Robert Hugill described Londinium's performance of Benjamin Britten's virtuosic A.M.D.G. as 'a tour de force... presented with a confidence, firmness and vividness which was altogether admirable' (planethugill.com)

Londinium is committed to contemporary repertoire, and has given several world and UK premieres, including the first performances of Perpetual Light: Requiem for an Unscorched Earth, by Jessica Curry, at the Old Vic Tunnels: 'a dark, tormented piece, punctuated by moments of brightness...that radiated hope, the emotional thread that tied the whole piece together. From start to finish, Londinium perfectly captured this delicate emotion...' (Kay Kempin, Bachtrack) and the UK premiere of Nico Muhly's Recordare Domine. It also features on the premiere recording of Antony Pitts' new oratorio, Jerusalem-Yerushalayim, released in 2013 by Hyperion. Composer Cecilia McDowall commented that 'The two soloists brought an ethereal quality to a powerful, yet most poignant performance' of her The Lord is Good, while Eric Whitacre commended Londinium for 'One of the most beautiful performances of 'Sleep' I have ever heard'.  

The choir has featured in the Classical Brit Awards at the Royal Albert Hall, performing with Bryn Terfel and Rolando Villazón. It provided singers for the Philharmonia Orchestra's performance of Prokofiev's Ivan the Terrible at the Royal Festival Hall, conducted by Vladimir Ashkenazy, and was the semi-chorus in a performance of Verdi's Requiem at Cadogan Hall. Other engagements have included recitals for the Art Fund, the Friends of the Georgian Society of Jamica, Special Olympics Great Britain, the British Library and the David Shepherd Wildlife Foundation, and the choir has sung in venues as diverse as the Natural History Museum, the Crypt Gallery at St Pancras Church, the British Library and Cliveden House.

August 2016 saw Londinium's first overseas tour, to Colmar in Alsace, France, where the choir gave critically acclaimed performances of British a cappella choral music in a programme entitled 'Perspectives Anglaises'.

In July Londinium recorded its debut CD, The Gluepot Connection, a selection of music by twentieth-century composers having a connection with the George pub (nicknamed 'The Gluepot') in Great Portland Street. It will be released in March 2018, on the SOMM label, with the launch concert at St Sepulchre's on Saturday 10th March.