Nina Barbour completed the stage aboard's Tracy Priest's Calle after a clear jump-off in 43,70 seconds.
The pair was followed by Ben Walker (Havanna de Cavron) and Holly Smith (Grennanstown Sarco Luxhill) in a fourth and fifth place.
Routledge also jumped to victory in the 1.30m Grade C Championships. This time with Centos Girl under the saddle. He was followed by Ward Bryony (Figaro VII) and also placed third with Firkov Du Rouet.