Close the banks for days, ration food and energy, institute strict capital controls - with most probably a few fast patrol boats at Glyfada harbour to check every departing yacht for cash and bonds.

BBC: Greek referendum is coin-flip on euro exit

Ms Sheeran said Egypt had just widened its food rationing system after two decades and Pakistan had reintroduced ration cards after many years.

BBC: RELATED BBC SITES

Mr Sistani argues, however, that the ration cards used for the UN's oil-for-food programme (which have just been reissued, without many hitches) could be used as voters' registration cards.

ECONOMIST: The troublesome, vote-loving ayatollah | The