There is a very good article on the Points Guy website that explains that there are three main sources of added fees to award tickets that depart from or travel through the UK and gives a good explanation of each of them. He's talking about BA and AA but it's certainly relevant for those of us booking award flights through QF when travelling on BA and any other airlines departing from UK airports. It's a US based website and the amounts are shown in Pounds and in US Dollars.