Hey Robbie,
you have probably seen the rear kits available from Burtons and the like.
I contemplated something similar on the Capri recently, but wanted it to remain as std as possible.
It was also suggested to me that the rears do bugger all in comparison, and just help to keep the car straight.
So it was just a good refresh, new slaves, pads etc, and good to go.
Everything UK wise seems exxy at the moment,especially due to freight.
With little air freight flying, the cost of getting some bubble arches here equated to 1 arm, and a leg, plus 1/2 a kiwi.