I have CA Britline account and when my card expired they sent the new one by registered post - no problem. I found them very useful when we first bought our house and our French was practically non-existant, but we now have a local account as well. You mentioned paying cash into your local CA branch but I thought it was only possible to send cheques by post. I understood that banks are Departmental franchises, not national as in U.K. I must admit to having been amused at receiving a lot of the information in French when it's supposed to be a British speaking branch.