Progress !
Using a fresh install of X3, I think I managed to include all the V700 features needed and I have the console lit up and working as the proper control surface it should be.
The reason I thought you could not connect the console and IO, each with their own usb cable, was because the V700R would drop its USB connection whenever the V700C usb was plugged in. The answer it turns out is to move around your computer trying different combinations of usb ports. I eventually hit upon two ports that would connect both V700 units simultaneously. Maybe the units need to connect through different motherboard usb controllers.
Also I managed to obtain a proper Roland connection cable for the units. A seller on e-Bay called "rhythm_active" has a few left. Based in Australia, he managed to find the last stock on that continent. He tells me he may keep hold of some for the V700C and V700R units he has for sale. Just look up "Roland 05120490 cable" to find him.
Anyhoo, as I now have a working setup, I'm looking into upgrades to Platinum and Windows 10 now as these are well covered in the Forums. Thanks again Rob for the assistance - got there in the end!
Gerry