Thanks for the reply Sean. Sorry I didn't reply sooner, but I was in a rush trying to get my tackle sorted out before I went away and was too busy trying out new knots.
I understood what you said, and tried it on holiday.
Nothing broke, even with the backing knot being pulled around the coral heads, so I must have done something right
The line coatings on these new lines must be far far tougher than I ever thought they could be!!!