Security for charges

28.  Scottish Natural Heritage may require a person who incurs or is about to incur a charge to deposit with them, or to give security for, such sum of money as is, in the opinion of Scottish Natural Heritage, reasonable having regard to the amount or probable amount of the charge, and where such a person fails to deposit or give security for the sum of money required Scottish Natural Heritage may detain the vessel in the harbour or goods on or in harbour premises, in respect of which the charge has been or will be incurred, until the requirement has been complied with or the charge paid.