thanks for all the advice, my son and I used a lubricated (Spit) half blood knot yesterday and although it was not fully tested it certainley didn't break or come away.
Reading through all the replies it seems that perhaps we need to get 'updated' on knots.
Much appriciated to all. I think we are planning to sit up the kitchen table with hooks and line and the lap top acting as teacher to try them out and learn a few inside out.
Thanks again.