nuku vanonyi cudjoe-calvocoressi was head of politics at st george 's school in ascot .
he has now been banned from teaching for at least five years following a hearing by a national council of teaching and leadership -lrb- nctl -rrb- disciplinary panel in coventry .
on june 30 2014 cudjoe-calvocoressi was convicted of indecent exposure at berkshire magistrates ' court following the june 13 incident on-board a train .
the exclusive st george 's school in ascot -lrb- pictured -rrb- which was originally a boys ' school .