The School of Night have been surprising and delighting audiences with their literay improv shows for more than 10 years - they don't often do shows, so come on down while you can. 

Here's the blurb:

"Revived by maverick genius Ken Campbell, the theatrical heretics have re-formed to summon the muses, raise the dead, and spontaneously create a new Shakespearean play from audience suggestions.

The School Of Night was an underground sect of artists, scientists and philosophers, who may have secretly written Shakespeare’s plays. Revived by maverick genius Ken Campbell, the theatrical heretics have re-formed to summon the muses, raise the dead, and spontaneously create a new Shakespearean play from audience suggestions.Following rapturously received performances at The Royal Court, Shakespeare’s Globe and The British Library, the School of Night bring their astounding brand of extemporisation to Omnibus."

http://omnibus-clapham.org/event/the-school-of-night-improvised-shakespeare/