Peak performance events ran a 10K recently in Worcester and it was terribly organised. I wouldn't touch another of their events with a long barge pole. The Worc. AC 10k is fast and flat and although it is a 3 lapper, its next to the river and quite pretty. There are some great smaller runs in Worcs and Herefordshire: Gords 6, Harewood Hurtle and of course a regular parkrun. There are also plans to start a parkrun in Hereford.