The entertainment stars were present at KOKO Foundation’s Letters Live fundraiser
Riz Ahmed, Ghetts, Celeste, Richard Gadd and more also performed
The BBC show, which also starred Martin Freeman and Amanda Abbington, ran from 2010-2017
FKA Twigs will be reading out a historical or personal letter at the event
Including 'The Imitation Game' and 'Sherlock'
He plays Vincent, the hard-drinking father of a missing child in 1980s New York in the Netflix drama
The 'Eric' star talked NME through his recent listening habits, including Elbow, Max Richter and Dobrawa Czocher
Spoilers ahead
The Benedict Cumberbatch-starring miniseries revolves around a missing nine-year-old boy
The six-part miniseries stars Benedict Cumberbatch as a puppeteer trying to find his missing child