I contacted the "Caravan Man" as advised by Hob and others who also does work for Dom at North Walsham. But he doesn't work this area and suggested I contact Steve Amos at Wensum Caravans. web page below.

Short story, shorter, £190 full service after which he'll spend 30 min explaining everything to me. Twin axles £220

http://www.wensumcaravan.co.uk/about-us/

B