I found this fantastic website - < DIY Kits & Components > - amongst all the other handy fitting accessories, they sell a Land Rover Td5 Sandwich Adapter Kit (which is mentioned on the MadMan website at MadMan - Temperature Adapters ) - see Coolant Adapter - Land Rover Td5 - and it's only around AUD $25.00 which is a bargain! I was surprised that Nata Enterprises doesn't sell them too (nothing listed at http://www.nata.net.au/shop/adapters-senders-c-25.html ).
So I will fit and use the sandwich plate for the coolant temperature sensor probe.
I have received the low coolant level sensor from the Engine Saver people which will replace that sensor.
Meaning that I can now get rid of that plastic coupling in the middle of my top radiator hose!

