Right. My PM was a bit short and sweet...
Go to Halfords and buy:
Cable
Connectors
With the connector: Split open the outer plastic casing so you are left with just the metal bit inside.
Cut the big bulge of metal off the end and feed the cable into the metal clamp from above. This metal clamp from the connector fits inside the throttle lever thingy.
Then feed the cable backwards back to the pedal, cut so suit and connect.
FYI: You might need the big bulge of metal on the end of the cable to connect to the pedal. Double check before cutting it off.
I know its not perfect but i had it on my conversion and it worked fine.