If theyve been sat for 6 months, I'd drive it carefull home and then bin them for all the cost involved, I wouldnt want to trust the fins, they will be pitted and lumpy where the pads have held water against the disks too most likely and after scrubbing all the rust off, I'd want to swap the pads anyway.

You can probably get OEM disks and pads for ~£50 I'd imagine.