New battery

I got bored of my car not starting so bought a new battery.
This didn't help at all (bit annoying that), but the battery is bigger and seems to make the engine run smoother.  Specifically the voltage is more stable which previously impacted the injection times quite a lot.

The other issue was that turning the lights (HID ones) previously would stop the engine (due to voltage drop) unless the RPM's were up, now the lights or fan have no effect on the engine.

All good stuff.

Battery is a PC680 (with metal jacket), and I have mounted in the passenger footwell, with remote connections in the engine bay.

If only it would stop raining.