I've turned up another photo of WD353. This aircraft was with 2 FTS Church Fenton from 22.9.1969 to 14.5.1974 - since these dates encompass 2 FTS' entire existence it would suggest that this was an ex PFS aircraft.
Note that, as with all 2 FTS Chipmunks, she wore the first permutation of the Red/White/Light Grey scheme (red lower fuselage, wingtips, tailplanes, wing leading edges and wingroot fairings).
"39" in the background is WK643.
