Update 11 June 2014
I’ve had confirmation from the event organisers that the B3227 won’t be accessible from South Molton town during the event, but the roads will be opened again at 6pm.
in additions there are long term roadworks on the A361, more details can be found at: http://devon.roadworks.org
Note for people travelling to Umberleigh from the direction of the M5 and A361 (North Devon Link Road) there is an event in South Molton on Saturday and the centre of the town will be closed to traffic.
I’m not sure if you will be able to access the B3227 for Umberleigh from the town. You may want to allow time ( 22 minutes, 16.5 miles) to travel onto Barnstaple and back down the A377 to approach the course from the North. This takes the same amount of time as going cross country from South Molton, but adds an extra four miles to the trip.