Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Knightley was sometimes considered eccentric; for example, he used the bodies of dead mice to act as a guide for the painters on the Queen's Hall, his preferred colour matching the shade of grey found on the mice's bellies.
Gallery
Queen's Hall, 1912
St Paul's, Isle of Dogs, 2006
References
Rennison, Nick (2015). The London Blue Plaque Guide (4th ed.). London: The History Press.