Yes they all worked as one UnitFound a detailed caption for the canteen photo in post #23 on Facebook - see quote below. This suggests they were ambulance drivers. Doubtless the ARP canteen was made available to various support services during the War. The photo is dated 26 October 1939 (Source: Media Storehouse).
"Ambulance Drivers with Tea at A.R.P. Depot, Sparkhill, 26th October 1939
A nice cup of tea. Ambulance drivers have a cup of tea at a canteen for A.R.P. workers at the Court Road depot, Sparkhill, which is open day and night. 26th October 1939. © Mirrorpix
Staff
Birmingham Post and Mail Archive Mirrorpix"
it did not matter what
Badge or Insignia
you wore

