I decided that my bank A O2 sensor was not " flip flopping" as quick as it used too using my Nanocom.
So purchased an AMR 6244 from Island as my chassis code is WA38.
Fitted the new sensor which is physically longer than the NGK that was installed, only to find that the car didn't seem to run well.
I've now refitted the old one and she back to running smoothly.
So on looking at the "new" sensor it has a marking on it of; FAE 77350 and on Googling this it turns out it's a generic sensor for 4.6 Range Rovers built between 1994 - 2002.
The Range Rover P38 parts catalogue shows three differing sensors depending on chassis numbers, surely this means that a single generic sensor is incorrect for my vehicle.
I'd be interested in others opinions and whether only fitting Ngk Sensors is the way to go.