You can see the NCN2 signs here clearly showing that the cycle route is off road and going around the roundabout on the shared use footway to the south and then west. https://www.bing.com/maps/?cp=50.708338%7E-2.422797&lvl=17.9&pi=-17.5&style=x&dir=87.6

https://www.bing.com/maps/?cp=51.751265%7E-0.22522&lvl=17.9&pi=-10.2&style=x&dir=38.4