That photo of WD345 must have been pre-1970 as the aircraft was with the RAF's premier UAS at White Waltham at least by 24 Jan 1970, which was when I flew her for the first time.
24 Jan 1969 Flt Lt Pete Lane + me on 'LP 9 and 11' for 1:05 was my first trip in '345; 17 Apr 1973 was my last trip in her flying '12, 13, 17A' for 1:00. Both flights at White Waltham.
ULAS held its Summer Camp at RAF Newton in 1972 and I flew her on many occasions then, between 26 Jun and 6 July.
In fact '345 was the Chipmunk in which I flew most of my trips in my ULAS student days.