Photo of JMB and London theatre personalites on roof of Coliseum(?)

[Nicholas]

I remember having seen a photograph taken in about 1915 of JMB, GBS, G. du Maurier and many other actors and literary people assembled on the roof of a theatre, perhaps the London Coliseum. It was possible a war charity event. Can anyone help me relocate it? I've tried the database on this website but with no success, probably because I was putting in the wrong information.

I found it on page 34 of the Database.