I've always resented having to pay a credit card surcharge for using a BA branded credit card to pay for BA flights but today's experience trumps that.

I decided (foolishly or otherwise) to spend £160 to book CW upper deck seats for our return fight from Sao Paulo. I could only pay using Visa or Mastercard! Utterly ridiculous! Why promote a card promising 3 airmiles per pound spent if you can't use the bloody thing? Tempted to ask for a refund of the £150 fee.