It is one of the more unusual artist-muse relationships, yet the friendship between the east London-based artist Pierrick Mouton and the French-Cameroon Protestant nun Sister Germaine is now the subject of a new exhibition. Mouton got to know Sr Germaine while seeking to document the daily life of the Deaconesses of Reuilly in Versailles. He encouraged her to document her life through pictures and video diaries, despite the fact that she had no experience of working with cameras. It is at the N