Beagle, the dayglow strips on XH478 are at the top of the fin, on the nose behind the radome, on the ECM housing and (possibly) on the wing tips. I guess they would fit-in neatly with the aircraft's refuelling trials but the dates don't tally, so it's hard to work-out what they were applied for.
Tim,
Those sound awfully like Cold Weather Trials markings, carried when they deployed to suitably cold parts of Canada. According to Tim Mason's book, XH478 was used by AAEE for RWR Orange Putter trials
Alternatively - found this on a quick google :
http://worldwar2airfields.fotopic.net/p12554397.html