I gave Betty my e-mail address, but as I said she was going to undergo tests in hospital when she got home after the cruise, and it may be that the results weren't good so that e-mailing me is the last thing on her mind.
BTW I think they booked their cruise through Bolsover Travel, but they obviously won't give out clients' information.
I knew it would be a long shot, but thanks to all the people who have replied to my post.
Ann