Sproggett
Thanks.
My knowledge of Excel is very basic so I took that precaution in case I messed up the list irretrievably.
Feline
Thanks also.
I'll try your suggestions in due course. It would be good to learn more about Excel's features.
The other question was just a long shot because I knew someone who started in aviation, changed to computers and then emigrated to SA.
Coinicidences do happen. You say you would have been a contemporary of BEagle's. He and I were contemporaries on the London University Air Squadron (many) years ago.