Hi Sean,
I see that Baynham Honri (Percy's son-in-law) and Peter Honri's father, is also in the credits, but can't quite see for what.
Regards,
Peter.
There is mention of Baynham in "Working the halls" as film and television consultant. There are pictures of him operating a radio transmitter for the first broadcast from a moving train, operating a camera on R.M.S. Berengaria and as President of the British Kinematograph Society. It looks like he was more on the production side than the performance side.