The Even Splits Leeds 5K races are held monthly from February to November at the University of Leeds Brownlee Centre.
The races are chip-timed and EA licensed (hence results appear on Power of 10). Results are sent by text as soon as you cross the finish line, and your mile splits are published the next day. Plus you get a chocolate bar at the finish for your troubles!
Race yourself and measure your improvement month by month. Or make it a club event and race your rivals.