Besides the notification of interest rate rises, the letter mentioned that interest calculated will be rounded up to the nearest 1 (up from 50p)
As I always pay my balances off this won't affect me - however I'm wondering how CC companies are allowed up get away with this type of thing.
I daresay that along with the interest rate rise, this "beneficial rounding" will add up to fair penny in Barclaycard's coffers :(