Stripped front calipers intending to recondition them with new pistons and seals. Unfortunately the calipers themselves are too far gone to be saved. Bollox!
I think (touch wood) that I've sorted my brakes out - fitted new calipers, bled them through, adjusted the rear drums (with new shoes) and things seem muchly improved. Once the pads and shoes have bedded in I'll have a better idea. I dare not try an emergency stop yet - just in case they're still ****e!