WATCHMAN can you not get in contact with other lads that run that sort of ground regular,,, i belive theres a few good lads around hampshire, wilts , ect that run flint all the time,,,,, maybee get somthing there breeding,, if they sell ya pup. if not
like some of the other answers i would go along with the collie type thinking, not rulling out cattle dog kelpie ect possibly somthing light , around 40 lb so maybee a dash of whipp, but i wouldnt rule out saluki