So their (and others) booking systems let you select flights etc and when it comes to payment you have a choice - typically a debit card costs £x and a credit card costs £y. And they don't take any other form of payment. So, and I'm sorry if you've heard it before from me, why aren't they obliged to include this fee (or at least the minimum payable) in the taxes and charges lump? After all you can't escape it, can you? Aha they say. If you pay by something called, say, Electron there's no charge. So you do have a choice. So we needn't include it. Catch 22, I'm afraid!