During my routine maintenance a few years back, I noticed a broken strand at the throttle body end and several broken adjacent to the adjuster by the bulkhead, just where it leaves the pedal.
Having seen the exorbitant price of a replacement, as the outer was still perfectly good, I used the cable repair kit in a tin from Carbuilder Solutions (CRKIT currently £12)
This contains two long inners of different diameters and a host of ferrules to suit any occasion . Worked a treat and I now always carry one in the tool rack as it hardly takes up any space at all.