This portrait shows Edith Essery from Hartleopol in her Civil Defence ambulance uniform. Either an ambulance attendant or driver her ARP Pattern 71 serge uniform has an unofficial local rank badge. Two (narrow) yellow bars in the usual rank insignia for an officer (lowest senior officer rank) but these are much thicker than usually seen. The cap badge does not seem to be the silver ARP badge but is probably a locally produced example featuring a large 'A'.
Images from Hartlepool History Then And Now.
News about interesting insignia, ARP related info and period photos that turn up.