Demel, Wilhelm Carl Louis

Hi Neil,
Have you looked at the British naturalisation documents in the British archives?
There are about half a dozen Demel's listed, documents should give all the info you require.

This one looks like yours and there is also a Hermann listed:-

HO 144/1145/209422
Nationality and Naturalisation:
Demel, Carl Friederich Wilhelm, from Germany.
Resident in Manchester. Certificate 20790 issued 22 September 1911.

Rena in England