Ware 10's this weekend, so just one route....out and back to Lea Valley White Water Centre. Turn earlier for less mileage....por go long with a loop of Lea Valley (turn at Fishers Green Car Park).
WW Whitewater Centre & Back: 16.11km / 10.01ml run
Car Park, Forty Hall Trail, Spurs, Over M25, St Mary's School, Green Bridge, Trinity Lane, Whitewater Centre, Return the same way
https://gb.mapometer.com/running/route_5283643