Used to work in Filton, and can add that several wing components are made down there. Some A320 ribs are made there, and part of the A330/340 front (spar assembly) infact the inboard third of the front leading edge spar sub-assembly (to me and you, the front spar nearest the fuselage, with the "D-Nose" attachements fitted - ie the slat track attachments etc etc).
Think they may also make the odd A330/340 wing rib down there too, but nothing major. Cannot remember how many ribs there oare on an A320, but I can recall there are about 15 companies out there manufacturing them (including the states), and shipping them to Broughton to be assembled.
Hope that adds a little confusion!!
F