I worked in WHITNEYS FORD in Scotland Road,Liverpool about 1968, they used to get the staff to take the PXs down to their Aintree Branch as it had a large bit of land at the sides + back to store them. I had to deliver a Ford Pop?/Anglia?Prefect? anyway I jumped in at Scottie Road , to go to Aintree and the Gearbox had TWO gear levers?..I was shocked at first , when asking the senior Salesman "What gives"? with the gearbox he said "overdrive", I had a great drive down to Aintree, Into 1st......into second...then pull the second lever down ( down engaged ...up disengaged)....then knock the second lever up(dis-E_...then gear lever into 3rd...and knock the second lever down, The Ordinary gear lever had a blue knob , the O.D. a yellow knob. The car really flew , showed 60 mph (about 55ish), not bad for a side-valve, think it was a 1200cc., car was in great nick, but heard later it was bought as a job lot and got crushed at a Southport Scrappy.........Shame.