Do you realise that there's a thread for this on the "Slimming World Teams" section - lots of peeps doing the C25K programme at various stages - could be a real boost to your motivation if you try doing it and posting about it with a bunch of other people.
Its been fascinating to read how people have said how they've struggled with the 60 secs intervals at the beginning - yet 5-6 weeks later they are doing the 20 mins runs and being amazed by how far they've come!
The thread wasnt there when I started doing it, but I can certainly vouch for the programme and it really does work - having completed it I now run for at least 30 mins 3x a week - sometimes further and sometimes more often (ran 6.2 miles or 10K last week just to see if I could)