Having scoured the www, I came across the software and instructions on how to DV-In enable an number of JVC and Thomson camcorders, including my own model (GR-DVL30E).
It required a data cable to be bought or built and instructions in English and other European languages.
Well, I built a cable and followed the instructions........
I am now the proud parent of a DV-In capable camcorder
The software is fairly straight forward with options beyond what you need to accomplish this task.
The cable cost less the £5.00 for the component parts from Maplins and 20 mins soldering time (depending on skill)
Father and camcorder are doing fine