Does anyone recognise the armband ?

[Jim Strawbridge]

This photograph shows a soldier with his younger brother. The brother is wearing an armband which I suspect indicates that he was working on important government work
that necessitated his staying in his employment rather than being called up for military service. Can anyone elaborate on this, please ?

[centurion]

Is it possibly a Derby scheme arm band - issued to men who had joined but not yet been called for service.?

[Stoppage Drill]

Mentioned here http://www.1914-1918.net/derbyscheme.html

[centurion]

As seen here

http://www.foxhallmilitaria.com/ww1-british-derby-scheme-armband/

And does appear to be what he is wearing

[Jim Strawbridge]

Thank you Centurion and Stoppage Drill. Problem solved.