IIRC, about 12 He 111Zs were built, including prototypes. Two of them were accounted for by 418 Squadron Mossies - one in the air near Dole (going from memory) and another on the ground at St. Yan.
The first aircraft is covered on Dan Gilberti's Histavia site, on the 1944 crash page. Includes a still from a guncam aboard one of the Mossies.
The Australian War Memorial site also, last time I looked, had both the guncam and an interview with the pilot concerned, though I've never ordered it.