Found a replacement peliter on Flebay.
ordered from the states and for a lincoln . Du57-19N550-D . there are other units to use also
When delivered it was the same peliter unit but in different housing .
quite easy to Swap in to the range rover housing but take note the wiring colours are different but easy to work out the cross reference.
Been working fine since .

Cheers andy

Have this unit bookmarked on eBay but not sprung for it yet.

Peltier element for seat heating Range Rover L322 HHK500060 LR034450 repair

Look for a complete Heater/cooler unit for Jaguar (XF I believe), these are exactly the same and makes the fix to a easy plug n' play thing.
I didn't knew that they are the same units so I did not look for a left-side unit, therefor I had to take it appart and swap the Peltier element otherwise it would have been a 20Min. job.