Thank you m'dears for all the messages of support and encouragement that helped me have the courage to try this run! You were right, of course, it WAS do-able.
The first 8 mins were great, I'd just seen a siskin in the hedge (ok, I know now it's a siskin, at the time I though it was a budgie(!!), thank you RSPB bird identifier) and was thinking I'd get some seed for our feeder to see if we could get them in the garden when Laura announced I only had 60 seconds left on that run...I was well proud and grinning like a loony.
The 5 minute walk came and went too soon (will I EVER really be ready when she asks??), but about 30 seconds into the next 8 min run and coming round the bend I ran into best beloved walking the dog. Total embarrassment - he's never seen me jogging before - I picked up my pace to try and impress him and then took ages to get back into the rhythm once we'd passed each other so the rest of that run was blooming hard work. But...I did it! :o)