@Floridarider if you don’t need a “name” event and you are in the South East there are lots of running event companies that provide half marathon options. Try Phoenix Running (towpath at Walton on Thames so v flat except for the infamous Blue Bridge!), Saxons Vikings and Normans (Samphire Hoe is pretty flat except for a scorcher of a hill in the middle of the sea wall course; avoid the cliff course! And their Northampton one is pretty flat too), Saturn Running (towpath at Sonning near Reading) and Engima Running (some on the Thames in Runnymede so again quite flat). Phoenix and SVN also do track ones if you don’t mind going round and round a lot. The medals are very special from all of these and the runners are friendly.
White Star Running in Dorset is also fabulous but definitely not flat!