Hold off sending any new invoices for now. Should have an answer PDQ from the corporate office regarding the VAT situation. Will keep you posted.
Regarding the Crew/Pax Transport situation just include the 15% finance charge in your price and send us revised fee schedules for all locations showing the re-calculated prices. I know that is quite an undertaking and am truly sorry for how much extra work this entails. You can keep it on the regular third party invoice (if that works for you guys) just as long as it doesn't also calculate the 15% at the bottom.
Thanks for your patience and understanding.