The anti-spin strakes on RAF Chipmunks were only fitted from 1958, with the mod complete across the fleet c.1959. They were never fitted to the Canadian aircraft in RCAF service at all, as far as I'm aware. Obviously a different ADH chain!!
Plenty of Pprune "Pprevious" on the subject, including here:
Chipmunk is Beautiful
here:
RAF DH Chipmunks Smaller rudder fitted
and here:
RAF Chipmunks .
Bring on the thread drift, it's looming!
(Mods, be aware!)
And to get back on course, here's an interesting narrative on the NATP in Canada from an RAF participant, John Nish, in 1956, describing the journey (in his case, to Halifax) and the progression of the course, via London, Ontario (classroom work), Centralia (Chipmunk), Moose Jaw (Harvard) and Gimli (Silver Stars). A couple of years prior to Tony; but confirms that RAF (and NATO) wings were, in this case, presented on completion of the course before homeward travel.
http://aircrew-saltire.org/lib239.html