Thanks for your kind comments.
Thule 969 wing bars & 775 footpack from Halfords. I googled, printed off cheapest supplier & local Halfords price matched. The supplier is supposed to be within a 20 mile radius of the store you visit but the bike shop I found (based in South Wales) was good enough as the guy in Halfords said they have stores in South Wales!
Three racks (Thule 591) fit easily and I reckon you may be able to fit 4 if you alternate bikes facing front to back, but probably worth checking first. We use a roof box for trips to Ireland hence why I went for roof bars. The Thule 969s are quieter than last bars. I wasn't that impressed with Seat bars ( aero not wing), they also stand high but I'm guessing that is to compensate for cars with panoramic roofs. Worth checking if you have a pan roof that you can fit Thule 969s - if anyone needs any measurements, give me a shout.