Down to the last four but still trying! 1111 FiB (I am too old to have done binary numbers but could this be "Fifteenth in binary"? 71 DatWwEM ( someone suggested this could be "71 days at the wheel with Ellen McArthur" but I have tried everywhere to verify with no luck) I will keep trying with the other two over the weekend but may have to get back to you clever people Many thanks for your time and help.
My thanks to all who answered. Although I had already found the "Ellen McArthur" site it only says one of her voyages was 71 days plus. I thought a ditloid would be the title of a book, saying etc. Many thanks.