With Abbey changing it's name to Santander we got new cards recently (business and personal accounts.. New cards had the same number just the bank name, expiry and security number changed.
Well dopey me forgot to change the details with PAYPAL.. Renewing a godaddy domain name suddenly bounced back the paypal payment, only then did I realise that I hadn't changed the expiry number so I logged into paypal and changed it succesfully..
Godaddy again bounced back the payment, tried not going through paypal but directly through godaddy using the CC number.. Bounced back as unauthorised!!!
20 minute phone call later to the bank to learn that because the expiry numbers didn't match Paypal had sent out an alert to block my card
I know they're being security concious but surely a PAYPAL block should have been their first step (bank agreed with me and he was a bit peeved at how many times this has happened recently to others)
So guys, if you get a new card make sure you change the details online especially if there's only small changes like CSS2/expiry

---------- Post added at 13:27 ---------- Previous post was at 12:47 ----------
Wasn;t the end of the story though...
30 minutes later the card was still blocked..(they said it would only be 10 minutes) turns out that some blocks fail to be taken off properly.. Another 20 minute phone call later and glad to say that the essentials are now working OK