have you checked the relay base for good contacts as they us captured spade connectors and the contact area is very small and they have a tendency of being pushed back in the holder .the relay you have are they a well known manufacture and check...
@Wagon Loon , you may like to scuff up those inlet ports, they're too smooth/too polished. Too smooth an inlet port causes larger fuel droplets to form which is not what's wanted. Ideally, all heads [petrol and diesel] need some level of...
It's not that bad a job, nothing like as bad as removing an IRD.
There are only about 15 bolts to remove, and you won't have corrosion to deal with. Just make sure you get some thread lock compound for the propshaft bolts, and a torque wrench if...
Have you confirmed that relay 9 is working ok ,have you battery voltage on c123-1 and c605-3 on the inertia switch to ground .
and as mentioned by sierrafery the engine is not being immobilised