Took the cable off today, and it was rough to say the least. Obviously no lubricant in there whatsoever, and possibly lots of filth as it kept sticking at different points, and those points seemed to keep moving. So it's had copious amounts of brake cleaner and wd40 down there, to disperse any crap, followed by s**t loads of oil until it was running smooth. Thought I'd try it out. First junction I came to, I touched the accelerator and almost shot out into the traffic! So it seems my heavy pedal issue is fixed, and I now need to relearn how to drive my car. Only time will tell if the sticking is fixed, but I'm optimistic.