Car is now back from the garage. Handbrake works (hurrah!), both rear calipers replaced again, brake pedal still rubbish. They've now fitted a restrictor into the servo pipe to try and give some feel back, but it's not really done the job. I mean, it's better, but it's not like it should be. Emissions still miles out, so need to get that sorted before I can MOT again.
Seriously fed up with this car now.