If the radio lights stayed on, I would start looking at the fuse block under the steering wheel and the wiring harness going to the starter switch... look for corrosion and plugs that might look melted.
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When working with GEMS vehicles. Never try to locate a misfire by pulling plug leads off - pull the injector connector instead. Otherwise you can blow up the ECU.
Secondly never swap ECUs between vehicles to test them, because both vehicles and ECUs may stop working, and you'll have to have them all reset by a franchised LR dealer (ouch!).