, I may have cracked it, we'll see.
I saw a video on youtube where an Indian chap was explaining the problem about the 4/5 cables and offered 4 options to get round it.
The only one that didn't involve surgery to the tablet or a complicated routine was a splitter cable which I've bought (3rd time lucky I hope).
That is providing power through to the tablet (that was always the difficult part) there is a male USB 2 plug on the lead too, and given that the seneye is a male USB plug too, I need a female to female which will turn up tomorrow.
Then we'll know if this off-the-shelf answer works.
I'll post my findings, as always.