Thank you for the both serious and adventurous replies!
I think I've got enough to go on now - will draw some lines on a map and come up with some figures and that should sort him out.
What a true resource you all are- within a morning too!
Thankfully I am I/R rated but would probably never consider the trip in a single, especially not solo.
Perhaps after retirement when I have some time to play with
All the best,
EzY