Thanks Andy, that could be useful, as I'll probably be doing a 1/48th scale FB.VI before the larger version.
I don't think it was specifically Canadian-built Mossies, as this radio fit was common, at least on 2 Group, and 2 TAF aircraft, from at least mid 1943 onwards, with example serial numbers being PZ306 and HX917.
My subject in 1/32nd scale will be BoB Kirkpatrick's 21 Sqn aircraft, HR378, in late December, 1944, and, in 1/48th scale, Noel Shrimpton and Peter Lake's 464 Sqn machine, PZ353, during the Shell House attack, 21st March, 1945, both of which had this radio fit.
I've also seen cockpit close-up shots of other units, where these radio 'boxes' can just be seen, looking totally different, in size, shape and colour, to those normally found in most kits, that is, the type I normally refer to as 'Lancaster type', being the most commonly photographed (although not Canadian-built Lancs, which had different radios !).
Although I'm not certain, but I think, from text and pics in the Osprey 'Modelling the Mosquito' book, that the Tamiya 1/48th scale kit of the FB.VI has the radios moulded as these types - if anyone has this kit, or easy access to the instructions, maybe they could post a copy of the relevant section ?
There's no rush at all on this though, as it'll be some time before I get around to continuing, or starting afresh, and I need to do more research on the finer details anyway.