In reply to Zygoticgema:
You could try Parkrun.com which is a free, timed, 5k run every Saturday at 9 am.
http://parkrun.com/home.aspx
There isn't one in Guildford, but the nearest to you are Frimley and Banstead Woods (my local one), either of them about 30 minutes by car.
Register once on line, print your barcode and turn up. There's a mass start, then as you go through the finishing funnel you are given a token with your place and a barcode. You take that over to the marshalls, they swipe your own bar code, the token barcode, and the system then logs your time. Results are on the internet a few hours later, with photos too at Banstead at least.
About 160-200 runners turn up every Saturday at Banstead, whatever the weather. Next saturday is the 200th run there.
All of your times are stored on the site www.parkrun.com They show your time for every run you have done, your PBs and an 'effort %' which is your time as a % of the world record time for your age group, which allows you to compare your time with those from other age groups.
It's great for training because it's regular and the same people turn up, so you very quickly end up with recognisable people to chase/hang onto/try to pass/avoid being passed by.
Addictive and highly recommended. All shapes and sizes - from about 8 to 80, whippets to steamrollers. All run by volunteers.
Run number 8 for me on Saturday at Banstead.