Hi again all,
I have progressed further on this.
There is a module in the rear right hand corner beneath the tub in the cargo space area that controls the Bluetooth.
It is also connected into the MOST fibre ring so if it fails entirely or is disconnected any devices on the MOST system (Media Orientated System Transport according to the manual) will not operate unless the fibre connection is patched though. MOST system connects all infotainment items including the amplifier etc. There are bypass plugs available on EBAY / internet for the fibre - I searched Landrover MOST bypass and several options came up.
Luckily my module is only faulting on the Bluetooth and not the fibre so is still keeping the fibre loop operational.
I have seen in other areas that there is an issue with water ingress damaging the module however in my case it is not the issue and the area is bone dry.
I have had a couple of quotes for replacement -$750(Australian) for new and around $200-$300 working second hand.
I have removed the unit from the vehicle and looked into its internal circuitary to see if i am lucky enough for it to be a dry solder joint. However as I don’t have any way to recover the system at this time if I make it worse I haven’t progressed down that path too far.
There is an indentification label fitted with part number AH42 10F845 AA however that didn’t appear to be the LR part number and the dealer took a bit of time to locate the correct number. Searching on that number in google and eBay brings up quite a bit of information and also second hand units for sale.
Interestingly enough, when it worked I could see it in the list of equipment in the code reader, however when it stops I don’t even see it at all as a device or as a fault code.
On the side of the module, the top two connections that are for the fibre ring and the bottom double row connections in my vehicle only has 2 wires connected via the multi plug for power supply. If power is disconnected the MOST fibre ring is broken as well.