I've finally found a way to avoid the cheeky GD fx fees. I could never seem to combine a UK based address, with a request for payment in USD to a UK bank account - and I couldn't set it up with a UK address and US based bank account. As a test I added my GBP wise.com bank account details, along with sort code and account number, along with the swift code for transferwise - had the payment currency set as USD in afternic and it's all come through as USD (minus the wire fee) and I've probably saved 80% of the FX fees. Probably adds 2% to the net amount on a sale - not much, but money for nothing (as it clearly was for GD).