We did a compression test on No.4 and it came out at 50psi. The other three were 210-215psi. It's very difficult to see on my crappy pics.
If you look carefully you can see the scoring to the bore:
You can perhaps see it better in this pic.
Mark has some better pics though he hasn't uploaded them yet.
It's fairly obvious that a piston ring has snapped as there is some prominent scoring that is caused by the edge of the piston ring. Tis a real shame as the other three bores are absolutely perfect. Trouble is that when I started taking it all apart, I was hoping there'd be no real bore damage as I was hoping to re-hone and fit new rings and be good to go. It looks like the scoring is way beyond that, so this block would need over-boring and a new set of pistons. The block is a high comp, but my issue is that we are supposed to be fitting Mark's rebuilt GZE in a few months time, so tbh I'm not sure I want to spend around
£500 rebuilding the bottom end. 
I admit I'm still a bit torn with my love for an NA as I admit that if Mark's engine wasn't available then I wouldn't be looking to fit a GZE into my car.
It seems that the likely option to get the car back on the road
(it's already been off the road for 3 months) is to fit a secondhand bottom end and use my head complete with cams and all that. It's a difficult one as I admit I could do withouth the expense given this is the month I go self employed and leave my permanent job!
