John Atyeo and Sarah Cox made what look decisive moves at the top of the veterans standings with one race to go.
Oxford City’s Atyeo finished 15th at Lawns Park in a time of 33.01 to open up a ten-point lead in the men’s vet 40 rankings.
Alchester’s Cox finished tenth at Swindon in 26.39 to take the outright lead in the vet 35 ladies’ standings.
Cox heads clubmate Sam Usher, who was 16th in 27.32, by nine points, so is firm favourite to take the crown.
Swindon’s Brian Gardner did not race on his home course, but has a lead of 29 points over Alchester’s John Nelson in the vet 50 event.
Oxford City’s Stewart Thorp, who goes for the Apex Sports Chiltern League title on Saturday, heads the vet 60 rankings by 73 points.
Banbury Harriers’ Rose Kelling tops the vet 45 ladies’ event by 32 points.
The vet 55 ladies’ race sees Newbury’s Sarah Fowler lead Oxford City’s Gwyneth Hueter by 17 points.