Had split the rear caliper prior to painting as suggested by someone on here, after looking at the pistons I noticed one was further out than the other, and after trying to move it I understood why, seized rear caliper syndrome. On the bench, gently rotating said piston reviled only one seal each side, someone obviously didn't think two seals were required
Tbh the pistons look fine and hopefully the remaining seal will be OK to reuse, just hope I can source some outer seals (dust?)