Paypal Account

I've got an issue with my Paypal account at the mo. I've recently been sent a new bank card for my current account and the big number across the middle has changed, however my Paypal account is registered to my old account number.

I'm pretty sure this won't be a big deal as I've never actually verified my other account anyway so I've just removed it for now and plan to attach it to my new number asap. Has anyone had any problems with things like this in the past? I was just wondering if I did have any money in my Paypal account when this happened whether it would have caused me any big issues or not?