I had to google
PD4 106 coaches, it was before my time; before Google's time too, it offered no enlightment.

Are you sure about it being a '71? That was a big engine in that era, particularly for a bus, could it have been a '53? I've experienced some 'interesting' 'boxes in my time too; a rear engined Bedford (ex Kirklands) that had 1st in the centre of the gate, 2nd and 3rd toward the driver with 4th and 5th back past 1st on the left.

Also a 5x2 Scammel that had the electric splitter wired A about F, up for low, down for high.

A lot of Yank trucks had a switch to isolate the air to the front brakes in slippery conditions.
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