By 'back bar' do you mean the fence piece that slips into the protractor? If so, you can readily get that from EKAT for $14 (cuz I have a few [cool]); same with the stops, and fence clamp (part to left of the fence holding it in place). All of those are still available.
The clamps naturally are still in retail.
You said hinges so I presume you mean the hinge in the back for the guide rail and the front piece the rail sits in? If so, I'm sure they are also on EKAT, but you might do better to post a "WTB" posting in the Classifieds here to see if a dealer still has a 1080 kit. I walked into my Woodcraft here and they had two boxes of 1080 parts (everything but the basic table and the rail) on clearance for less than the price of two fence clamps [cool]2. If they had 2 sitting around, I'm sure there must be a dealer with one in a dusty corner they might ship to you (UK dealer; or find a US dealer and someone willing to proxy). If I go to Woodcraft soon, I'll see if the other kit is still there. If so, we could see if you want it and I'd ship everything but the fence as that would triple the cost when you can get it for $14 from EKAT in the UK.
If you want Qwas dogs/rail dogs, I'm shipping some to my friends in the next few weeks; PM me your email and I'll talk to you about it if you want some.