I have a Park brake fault dash warning and a constant amber warning light.

Electric park brake seems to work fine. Diagnostic tool reveals the following:
C1A48-01 - Warning lamp circuit, signal lamp connection failure - General failure information - general electrical failure (2B)

This won't clear.

I've disconnected the epb module and sprayed contact cleaner on the connector, to no avail.

I've done some searching on this topic but found nothing related to the L322 (Tdv8 3.6 2007).

Anyone come across something similar and find a solution?

Warning lamp failure makes me think its not the actual operation of the park brake but rather the electric circuit that activates the handbrake indicator on the dash. Is the light coming on and going off as it should? I suspect an issue at the park brake itself related to the wiring such as a corroded connector.

I will try to remove and inspect the loom from the brake module to the left side boot space. The connector did not appear to have any signs of corrosion but it is possible there could have been hidden within the connector.
Failing this, what could my other options be?

And yes, the red light goes off when the engine is started/park brake released

I don’t suppose you made any headway with this did you?
I have the same fault and I’m struggling to find the problem!
Cheers,
Mart. Current wallet destroyers:
2002 DISCO TD5
2003 TD6 SE
2010 TDV8 VOGUE

No, not yet. From researching the issue, I found some similar situations of electrical problems caused by corroded connections.
These all point to the large loom that sits on the right side channel beside the driver seat (RHD) above the sill.
Water ingress from the sunroof/leaking windscreen tends to pool in that area causing the factory splices to corrode.
However, being a Land Rover, the cause of the electrical problem could be anywhere.

Fair play, cheers for the heads up on some places to look. I will pop it up on the lift this week and look at the condition of the plug going in to the module, then start looking at tracing the loom and checking for breakages. I’ll let you know if I ever find the fault! Current wallet destroyers:
2002 DISCO TD5
2003 TD6 SE
2010 TDV8 VOGUE

Best of luck with it and report back if you find anything.