No.
Whereas a Prohibition Notice may temporarily prohibit a ship from sailing, it may only be served where there is risk of serious personal injury or serious pollution. A Detention Notice, on the other hand, may be issued for a much wider range of reasons under several Acts and numerous SIs, e. g. for contravention of crew agreement provisions, a ship being dangerously unsafe in a UK port due to overloading, a tanker attempting to leave a UK port without an OPIC, in other words, the more extreme cases. In theory a ship could simultaneously be the subject of both forms of notice.
