Weasel flamethrower?

[Dave Block]

I came across an interesting photo in David Gordon's book 'Weapons of the WWII Tommy' on the week-end. It shows what appears to be the No.2 Mk.2C Transportable Flamethrower mounted on the M29C Weasel. The author is somewhat vague in the text: "Some (Weasels) were also equipped with flame throwers but it is unknown if any of those so modified were used in action".
There are no markings/WD nos. on the vehicle to indicate nationality and the tracks look very odd (they remind me of Universal Carrier tracks). The whole set-up is even more exposed than the Wasp and I shouldn't imagine it would be very popular with the crews.
Can anyone shed some light on this beastie, i.e. who modified it and, was it ever used?

TIA, Dave