two british men have been fined $ 3,000 for threatening behaviour on board a thomson airways flight .
one allegedly threw peanuts and a pound coin at cabin crew , with the other was accused of hitting himself on the head with clenched fists during the disturbance , which forced the flight from london to mexico to divert to bermuda .
the two holidaymakers could also face a four-month jail term , with local sources claiming the pair are struggling to pay the fee .