A Prohibition Notice may be served in the UK on a ship operator or master by an MCA inspector (who is usually a surveyor) under section 262 of the Merchant Shipping Act 1995 to give notice that activities being carried out or likely to be carried out by or under the control of the recipient involve, or will involve, a risk or imminent risk of serious personal injury or serious pollution of navigable waters, and that they contravene the specified statutory provisions, and that they shall not be carried out. The Notice may also prohibit the ship from going to sea until the matters are remedied. Unlike an Improvement Notice, a Prohibition Notice can have immediate effect.