FWIW, I've spoken to 4 people about the cam sensor now (2 of them not on the forum) and they've all reported better running after swapping it out.
You do need to pull a battery lead before replacing it though, to re-register it, otherwise the ECU may carry on ignoring it. They're funny cars these. They do pre-flight check when you turn the ignition off (you can hear the throttle flapping about), so if you pull a sensor with the battery connected, it'll fault code it.