Sorry, I could not post to the original thread for some reason.
Anyway, the update to this situation is as such:
The car is still driving itself, but not so much. In fact, its only
pulling away of its own accord slightly now. I still have trouble when
driving off from cold (stalling when going into drive) but when the
car warms up all is ok.
I have tried the Automobile Association and a local garage and both
have no idea what is wrong. I am recommended to take the car to the
nearest Ford dealer, which I had planned to do on Tuesday. I am
wondering if I should wait, however, as the problem seems to be
improving of its own accord and if I let the car warm up before
putting it into drive it is fine.
It has a carb (webber), to answer a question asked previously.