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Welcome to the forum, here you go:-
993 SSL [always]
465 SSL [always]
These settings are for IMAP mail.
Hope it solves your issue.
Am I OK shifting the incoming to IMAP from POP3 please ?
Your choice, they are 2 completely different ways of operating e-mail. With IMAP, the mail is held on the server and can be accessed from multiple devices, POP3 downloads the mail to the client and is deleted from the server (unless specifically told to leave a copy on the server) BT don't advertise the fact but does in fact support secure POP3. the server mail.btinternet.com supports POP3 using SSL on port 995 and secure SMTP on port 465