Managed to fix the problem (Well temp fix at the moment).
Pulled the righthand rear panel to expose the fuse box in the boot above the battery.
Removed each connector in turn and inspected for any sign of corrosion … known Jag XL problem due to leak in one of the welds.
Found the bottom connector when removed exhibited corrosion where cable / individual connector pin entered the plastic connector block.
Could not remove the pins but did multiple insertion / removal of the connector to scrape the pins … this has worked.
When hazard button on dash is pressed, the hazard warning lams flash as expected.
I'll try and source a new connector or one from a scrap yard and replace in the future.
For now … operational once more.
cheers
Jim.