WW2 Civilian Anti-Gas School (CAGS) Civil Defence Instructor Badge

I've finally managed to fill a gap in my badge collection with the CAGS Civil Defence Instructor badge. It was issued to those that had attended and successfully completed the Civilian Anti-Gas School instructors' course. It's in the nationally trained gold colour (same as the ARPS Air Raid Precautions School badge). Although CAGS appears to have been a regular course run prior to, and throughout, the war at the Civil Defence Schools at Easingwold (in N. Yorshire) and Falfield (in Glos.), the instructor badge is extremely scarce (I've only seen this one and two other examples in 20 years). This popped up on eBay recently - I was just lucky enough to be online at the right time. 

The CAGS course certificates below were kindly supplied by Jon Mills.

WW2 Civilian Anti-Gas School (CAGS) Civil Defence Instructor Badge

WW2 Civilian Anti-Gas School (CAGS) Course Certificate

WW2 Civilian Anti-Gas School (CAGS) Course Certificate (Rear)