'Blackie & Kirk' 406 Sqdn RCAF

[hrossm]

Sqdn. Ldr. D.J. "Blackie" Williams was twice involved in claims for 2 victories in one day, the first on 29/30th April 1944 flying a Mosquito XII coded HU.O (serial not known, SOME possible candidates are HK138, HK179, HK228, HK231) when he destroyed two Do217Ks attempting to attack Devonport with Fritz-X guided bombs and the second on 21st July 1944 flying Mosquito XXX serial MM731 (code unknown but I wonder if it was 'S' as RCAF Squadrons lists MM751 as 'S' in 406 Sqdn but the Air Briitain serials book MA100-MZ999 does not show MM751 as being issued to a squadron and 3 vs 5 is an obvious opportunity for the dreaded misprint). Again the victims were Do217s. On both occasions C.J. "Kirk" Kirkpatrick was his navigator and the squadron was based at Winkleigh in Devon.
There is a photo in the Osprey Mosquito fighter/fighter bomber squadrons book that shows an aircraft with 'Blackie and Kirk' nose art which appears to be a XII (single stage Merlin) but the photo is not dated so I don't know if this was applied to the a/c used on the above occasions.

Please can anyone add to the code/serial/nose art information above for either the XII or XXX ?