Good for you! You've done well. I don't know where you should start in the program, though. I guess what you could try is increasing your running bits by 10%, keeping your walks but reducing them.
1.1km, walk 55 seconds ( repeat 3 times) and do this three times in your first week
1.2km, walk 50 seconds (repeat 3 times) and do this three times in your second week
etc etc. until you felt you didn't need the walks.
But if you'd like to be fully part of the gang here and be doing the C25k plan along with others, which means you get to graduate with us all cheering from our phones and laptops around the world, then you could join in with the plan. I'd go for Week 5 based on where you're at, I think. You'd find the first two runs easy but the third one would be longer than you've run without stopping so that would be a nice challenge. If that gives you the heebie-jeebies, try Week 4 instead.
Thank you for your advice it's really helpful as didn't want to start at week one and go back on the progress that I've made myself over the last few weeks.
Otherwise there's no reason not to start at week one like everyone else (I found Week 1 way harder than all the others so don't go thinking it is 'too easy')
The NHS C25K programme is designed to develop the psychological as well as physical stamina to run continuously for 30 minutes on a regular basis (despite the name, the distance, and thus the speed, is irrelevant at this stage and possibly forever)
I would go wk 5 or maybe 4. I think you would benefit from the gradual pyschological build up, though since you are already running a full kilometre between walks, to do wk 1,2,and 3 would not be progressing.
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