I've attached the relevant page from Vehicle Markings 1947 which gives the in-use Arm of Service serial number and background for an Infantry Brigade Group. Artillery AoS were assigned serial numbers 13, 14 and 15 on a red-over-blue background. Serial 13 was for the RCA Field Regiment, while serials 14 and 15 were artillery spares or 'alternatives.' I have photographs of the 1st Surface-to-Surface Missile Battery using serial 14, but I have no idea which RCA unit would have used serial 15.
But, hey... I have so much stored on my hard-drive, I'll probably stumble upon it some day.
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