Rob, the serial 397 relates to a unit of a Line of Communication Area, or Command, Army, or GHQ Troops issued from the mid to late 1940s. These were issued by the senior HQ concerned, not by UK. They changed again in the Middle East in late 1941 and 397 then fell into the RA block.
Without a background colour/s it is impossible to tell what Arm or Service the unit belongs to.
Regards, Keith
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