Many thanks. When I had posted my question I looked again at my wife's phone where her emails had then arrived. This may have happened because I signed on on webmail and confirmed the new password or, as you suggest because the change takes a while to propagate on the pop servers. I noted that the settings on her phone are pop3, whereas those for Outlook on our desktop/laptop are IMAP. I assume that this is because it is an android phone.
Our laptop on Windows 10 shows my emails but not my wife's when I last looked, but hopefully this will resolve itself. Perhaps I could return for your help if this does not happen.
In the meantime I repeat my thanks for your involvement.