Hi all, I have been doing some jobs to get my new car up to spec for my first trackday, needed to weld in some brackets for my bucket seats. I have been welding on and off all day.

My battery was disconnected and I had a good earth close to where I was welding. This isn't the first time I have welded the car but the last time I unplugged the ECU just to be safe, but forgot today.

Gone to start it after all my hard work and now it won't start, it turns over but just won't fire!

I'm cacking myself that I have fried the ECU. No fuses blown under the bonnet or in engine compartment but there are a LOT of wires and relays about.

I have no idea what to look for as the car is fully custom.
Woodsport converted V6 supercharged.

Any help appreciated.