Story I heard was, apart from no pins, the seat was still in the armament bay.
As the ac still "belonged" to MSU, they installed an orange box type tressel thingy, which riggers could sit on, so not to tread on anything delicate during servicing - hence no canopy - no brake chute etc etc
I think this was a farewell fling
Still, more famous than being towed past handbrake house on a bomb trolley wearing a bowler hat
Wonder if OC Eng at Lossie could pull that one off today - eh?