A City worker has been fined nearly £40,000 for forgetting to pay the tax on his car for just over a month.Sam Fisher, 30, faced prosecution by the DVLA this month over £50 of tax which had gone unpaid on his Range Rover.A magistrate sat in private to decide on the case, in the Single Justice Procedure, and concluded Mr Fisher must pay an eye-watering £39,769 fine for the slip-up.