Well, I went and purchased a dual batterty kit for the new car today, after doing a bit of research, I decided on the ‘IBS’ kit from TJM.
I went with this kit because, althought its a fair bit more expensive than a standard dual battery system, it gives me 2 voltage gauges, a charge meter and the battery ‘link’ buttons all in a single package.

The install was pretty easy, and it all seems to be working A - OK. Very happy to far..