So just to keep this going, I found the cause of my breakdown... A nut in the coolant.
Don't know how it got there, but it completely ruined the water pump!
With that swapped out, it's been fine. Makes a bit of a weird noise at about 3250rpm but I think I'm going to put it down to the insides of the silenced decat being destroyed by flames!
I then rebuilt the gear knob out of the six speed. Different size to the 5 speed so annoyingly I couldn't carry bits across
And then at the weekend I fitted an "Exhintake" cam. Which is essentially where you take a 1.8 exhaust cam, chop off the end where the cam angle sensor attaches and pop it in the intake side.
Had to redrill the cam gear, but I eventually want some adjustable cam gears to better tune it.
And then finally I put in an order with DanSTengineering for some throttle body bits. I was meant to be buying turbo bits, but the guy still isn't taking orders for exhaust manifolds and I'm getting bored waiting!
£320 for an inlet manifold, trumpets, throttle cable and silicone pipe. Plus about £60 for second hand GSXR throttle bodies. Should make for a fun car!