Thanks Leo_on_Geo but this is what I see on their booking conditions:
You must not pack in any luggage or bring on board any item specified as dangerous or illegal. Weapons, illegal drugs, and other items that could interfere with the safe operation of the ship or the safe and secure environment of our guests and crew are prohibited. The following are examples of items that guests are not allowed to bring on board, but is not intended to be an exhaustive list:
• Firearms, explosives & ammunition, including realistic replicas
• Sharp objects, including knives and scissors (personal grooming items such as safety razors and scissors with blades less than 4 inches are allowed)
• Illegal drugs & intoxicating substances
• Candles, diffusers & incense
• Coffee makers, kettles, clothes irons, heated hair curlers & hot plates