WWW you are obviously having to bite the bullet on this one but may I advise you and your co instructors to have a look at your contract of employment.If there is nothing in it about breakages(and I dont suppose there is!) By letting this fine stand you have renegociated your contract verbally in
your employers favour.To remedy this you will
need to emphisise that your payment was a one off and get something in writing in future, or the previous note about having to pay for a write off personally is dangerously close to the truth.Any bunch of
shisters who cannot budget for breakages are certainly up to pulling a stunt like that.
Life is to short to work for gits!!!