My son has emailed this to my husband and myself. It's not really our sort of thing but we can't even get started and annoyingly, he won't offer any clues. I've done a search and seen some postings on this puzzle and would be very grateful if someone could point us in the rght direction to get started.
Thanks ageing fast - we did get there in the end although I used the previously given clues on the AB for the blank page and the spreadsheet. Both my sons said that they did it in about 20 minutes which I find hard to believe!!