Will you be charged £1 top up fee even if you pay off the balance? Yes! Read it again... it says "We *will* also charge you a top up fee..." The conditions for this charge are "..where the amount of interest charged to your Account on *any* statement is less than £1..." So if you have paid off the balance, your interest is then "less than £1", so you will be charged.
This notice is notice of a minimum charge, and according to their terms and conditions they are telling you with at least 30days notice. So you can't complain when the charge is applied.
Basically, for anyone paying their balance in full each month this is a £12 annual charge. For anyone incurring interest on their account, the interest is offset against the £1 top up each month. If they charge you more than £1 interest a month you won't notice a change.
Have a look at this article on the same topic:
http://my.telegraph.co.uk/wwp/april_2008/you_will_be_interested.htm
I believe this applies not only to an AA Advantage Card with Citi bank, but across all Citibank credit card holders as the title on the document is "Notice to Cardholders Changes to your Terms and Conditions and Insurance Policy documents". There is no distinction to the type of credit card held.
Also, a point that further underpins the fact that this is a real charge - the phone menu of Citibank credit cards now has an extra menu (not at the top level) for people wishing to cancel their cards! People are cancelling this card en masse!
I hope this clarifies the issue :)
Regards,
/small print