All seems fine apart from a strange circumferential score/groove in the bore just in front of the hole that feeds the oil to the slave cyinder but according to my calculations, the rubber seal doesn't go down that far so it should be ok.
I can't figure out how it got there though.

Anyway, what I have also found is that the outer spring looks too short but I can't be sure as I can't find any reference to them.
This is what it looks like.....

This is what it looks like in comparison to the brake master cylinder spring...

I don't know if they are both supposed to be the same or not.
It does look like it has snapped but I would like to be sure.
The brake master cylinder one measures 3 inches.
The clutch master cylinder one measures about 2.5 inches.
Does anyone have one kicking about they could measure for me or if you are feeling really kind, measure the one on your car for me please?
Thanks.