In it, the confused driver is seen stationary on the emergency use-only helipad before performing a U-turn and driving off onto the road - via a pedestrian footpath between vegetation at the site.
It was taken by consultant surgeon Paul Thorpe, who said: "I thought people might be interested to see the latest twist to the parking problems at Musgrove."
A spokesman for Musgrove said: “Parking on the helipad could place lives in danger.
“The helipad is used several times a week for air ambulances to bring the most seriously ill or injured patients to Musgrove.
“We are taking steps to avoid this happening again.”