Thanks to Malone and Murky I have now completed the grid and found the instructions from the letters straddling the extra words.
This should enable me to complete 8 down and, if I combine two letters from 15 across, this leads me to a nine letter word. This is the name of a child's puzzle toy, beginning with M.
However if 14 across is what I think it is the middle letter is E.
This does not give the most common spelling of the toy.
Am I on the wrong lines?
Please put me out of my misery before I head off for my native Wales and the match.
All advice appreciated!