Having replaced the faulty injector, I connected the battery cables, put in some oil and tried starting the engine. No joy! The lithium battery spins the engine nicely, which is encouraging, but the ECU doesn't think it's turning at the minimum 50 RPM. OMEX suggests closing the gap between the VR sensor and the trigger wheel, and I'll check the polarity of the sensor connector wiring.

It's limited progress I guess.