So... after all that work, 2 miles from the MOT station the engine decided that C4 rod should exit out the side of the block... and shower everyone behind me with engine components (it was running sweet as before hand with no issues or warning this was going to happen!)
Anyway... I refuse to let the ZS die, so I have now ended up with another Hatch T16 that needs a bit of work (although good engine etc) and plans are to make one really good car out of the two