I’m now tearing my hair out over the endgame. I think I’ve separated the instructions at the correct point. I suspect I’m over complicating it and am missing something obvious.
If anyone is able to offer a hint I would be most grateful. I’m going to set up an alternative thread too in case such a hint might spoil the enjoyment for others... and in anticipation that a ‘May contain answers’ could well be required by others at some point...