Can you imagine going to buy a coffee at Heathrow and being told they don’t accept British currency? Or that JFK Airport doesn’t take dollars? As is customary we entered Tunis Airport with a handful of local currency left in our pockets, probably just enough to cover a bite to eat and a coffee before we boarded the flight home, trying to strike that balance between not running out too soon and not having any left at the end. All we got for our last remaining dinar was shakes of heads and wry smiles: once you’re airside, nobody accepts them. You can pay in euros, you can pay by card,…