Posted: 30/12/2013 at 22:55
Yes, parkrun. There are loads around the country. They all start at 9am on a Saturday (apart from Scotland who I think start a little later). They are all 5K. All ages and abilities are welcome. It challenges the individual to and they can watch their progress on an on-line log of their runs. Have a look at http://www.parkrun.com/ to find your nearest one.
For a girl you could also consider the race for life 5k series through cancer research UK. There may be one or 2 near you.
Other 10k races often have shorter races attached. What part of the country are you in? We are a bit short of 5Ks in the Thames Valley area but other areas have plenty.
Am assuming you may have already taken a look on the events search here on RW?