I very rarely use a garage let alone a dealer, but i have been messed around with parts, never dealt with sales, and to be honest after dealing with parts i have no intention to. I can say with out doubt it would not be worth the drive to Barnstaple but can't comment on the others. They are all under the same umbrella but run separately, as i found out when just ringing around for oil. £28 for 5 liters at Barnstaple £19 at Exeter.
Do you want to borrow my car to park on their forecourt?