I have 5 runs left with the minor irritation that my pace isn't covering anywhere near 5 km. I'm perfectly okay with that for now, focussing entirely on becoming able to run for 30 minutes non-stop.
Thinking forward, I am contemplating a strategy to learn to run faster using the C25K programme all over again. With 22 runs under my belt, and a few faster final minute efforts the past three sessions, I'm confident that I am capable of running several quicker one-minute runs that are interspersed with walks. My plan after completing the 63 runs of the regular programme successfully, is to alternate between W9R3 (30-min non-stop at my regular snail pace, sub-5 km) and W1R1→W6R2 at a healthier clip, perhaps still sub-5km. Every second run, therefore, will be re-doing the entire C25K programme but with the specific aim of a faster pace. By "W6R2", I estimate my pace in both the W9 leisurely, and W6 faster runs will merge somewhere in-between. By then surely I'll be covering 5 km in 30 min.