Was the prop on a dead engine featherable?
Yes it was. Peter Henley described it thus:-
"The tasks facing the pilot were daunting. Drag reduction was paramount, so the undercarriage and flaps had to be retracted as soon as possible, while flying the aeroplane with the left hand, because undercarriage and flap levers were in the centre of the instrument panel. Drag from the windmilling propeller of the failed engine would have been very high, so manual feathering would have to be carried out dextrously while flying, first with the right hand and retracting the relevant throttle and pitch levers (to the left of the pilot's left thigh), then changing hands to free the right hand to reach the feathering buttons, which were in front of the right-hand seat".