Be aware, the Dulux round London 300km cycle ride, with up to 2,500 riders, will be coming to Bovingdon. The 2nd stage is ridden on Sunday 12 May, and part of the course will be coming into the area via Chesham, Ley Hill, Bovingdon along Green Lane and the Chipperfield Road, to Chipperfield and on to Kings Langley. The map below shows the route, probably in the morning.