Ok - I'm stuck in a mind / body fog in that I want to be able to jog 5km without stopping but my body is having none of it!!!
I can walk till the cows come home - takes me about 1hour 20 mins to walk 10kms (which is about 13 mins per mile) without hardly breaking a sweat.

So, two weeks ago I started getting bored of walking - too slow for me. I have been out jogging 5km, 4 times a week but I just cannot seem to get that rhythm where my breathing allows me to keep going. I can't even get a full km done without stopping twice. I signed up for the Dublin Women's Mini Marathon in June as an added incentive and I would be the happiest bunny if I could jog the 10km in 60 mins but at this rate I'm walking it faster.

Any advice my friends?

I think this is a muscle imbalance. I can run 10-12 minute miles, but walking 13 minutes miles is about 7 minutes per mile too fast for me. I have seen other runners with the same problem and I think it is just you need to develop muscles you haven't been using before and work against the muscles you've developed for power walking. It's not likely a cardiovascular endurance problem.

I'd suggest doing a couch 2 5K program where you take regularly scheduled walk breaks. Run 3 days per week, ideally not on consecutive days. If you're new to running, don't run more than 3 days a week and cross train if you'd like to workout more. This will help avoid injury.

Week 1 - run 1 minute, walk 2 minutes - 10 x
Week 2 - run 1 minute, walk 1 minute - 10x
Week 3 - run 2 minutes, walk 1 minute - 6x
Week 4 - run 3 minutes, walk 1 minute - 6x
Week 5 - run 4 minutes, walk 1 minute - 5x
Week 6 - run 5 minutes, walk 1 minute - 5x
Week 7 - run 6 minutes, walk 1 miunte - 4x
Week 8 - run 8 minutes, walk 1 minute - 3x
Week 9 - run 10 minutes, walk, 1 minute - 3x
Week 10 - run 20 minutes straight! Tough, but you can do it!

Thanks a mill for the replies - gonna give it a shot and see how it works. Really appreciate your help.