I managed it this evening, my 5k route was completed in 27.49! I'm hoping it's not a one off but I'm not expecting a PB every time I go out, but I'm extremely proud of myself right now.
I've got a 5k race at the end of July and I'm not expecting to get anywhere near that time as I've ran the route before and it's hard, but I know I can do it and my runs now are going to concentrate on hills as I've not done many, my highest elevation being 33m.
It's doable people, I'm overweight and can make my legs go at a decent pace, so keep at it and achieve what you once perceived as impossible, because impossible is nothing, it's yours for the taking!