There's some excellent photos of the BAC 1-11 Erection shops (as the fuselage manufacturing area was called) and final line in the Photos section of the BAC1-11 Yahoo Group at
http://ph.groups.yahoo.com/group/BAC1-11/photos
You might have to join the group to view them. An overall view of Hurn Airport including the BAC factory is shown on pages 218 & 219 of "Wings Over Dorset" by Leslie Dawson (ISBN 0 9486699 10 8).
The 1-11 wings were made at Weighbridge but Hurn also made parts for the Jet Provost as the factory had originally been set up by ex-Hunting pesonnel (the 1-11 started out as the Hunting-Percival HP66). There was also the deHavilland factory at Somerford that produced the Sea Vixen as its final product. I beleive the SRDE (Signals Research & Developement Establishment) and Christchurch Council housing took over all that site.