I can recommend this if you're still looking for a hilly 400. It's the Chiltern Cycleway, out and back via Henley. I did it two years ago. Advantage is that it has roadsigns at most of the junctions! Can obviously rejig the start to get it to work better from your home if you don't live in Ealing. https://ridewithgps.com/routes/33981022
I can recommend this if you're still looking for a hilly 400. It's the Chiltern Cycleway, out and back via Henley. I did it two years ago. Advantage is that it has roadsigns at most of the junctions! Can obviously rejig the start to get it to work better from your home if you don't live in Ealing.
https://ridewithgps.com/routes/33981022