Trevor - Iook forward to receiving your communication. In addition to getting out some publicity at the Breinton 10 as suggested above by "bob", you might also want to consider the Herefordshire Running Festival on the 21st of September http://www.herefordshirerunningfestival.co.uk/
I am hoping to do this one in October (if I can get rid of a current ham string niggle) - I note this is listed on RW and also mentions the 15k in small print. I think it might help to get the 15k listed in its own right separately as the 30k distance might put some off totally and that would help getting more entrants overall and hence more money raised for a very good cause. Also suggest getting this listed on Fetcheveryone as lots of runners check that out for possible races to do.It could certainly do with more publicity. Trevor - if you like, you could email me a leaflet (contact me through this site?) - I could get a load printed and distribute them at my local Parkrun (Worcester).
I for one will probably do either of the following on the 21st: one of the Hereford Running Festival races (either 10k or HM) or the Black Country Run (Halesowen - 10k) - both better VFM.... ham string permitting!