SAE here is a full stainless piston and caliper service kit should you need it
Satinless pistons and service kit Best to contact them first but I'm pretty sure these are the calipers fitted to our Plus 8's.
They look happy enough to ship to you over there.
I've not had a problem with the fronts but had to replace my rear wheel cylinders which imho are the one's worth getting sleeved in stainless, I haven't as the new OEM cylinders are cheap enough and I do them myself.
p.s. Don't google Austin Princess
