Nigel, to clarify the position of Swift.
The Annual Service can be carried out by any NCC Approved Workshop, or Approved Mobile Workshop.
Repairs to the van itself must be done by a Swift Approved repairer.
Repairs to the items fitted inside, such as the fridge, water heater etc can be done by any of the manufacturers approved service technicians, (i.e Dometic, Thetford, Truma).