Had a result with new front brake calipers, found new Aut-X calipers on eBay from Online Automotive, the pair £124 delivered. They are new fully rebuilt Renault Lucas items with 54mm pistons, also sourced new sliders/pad carriers £35.56 each delivered from Car Parts In Motion on eBay. Really pleased for £195 now the question is whether to give them a lick of red paint before fitting or leave them OE silver, hmm...
I bet they do, bit more subtle than red. Just seems a shame to fit them as they are then they will end up going a dark dirty silver, then rusty colour. Still fancy red at the moment though.