In the UK, the possession, sale, and importation of certain types of swords, including samurai swords, are regulated by law. The Criminal Justice Act 1988 (Offensive Weapons) Order 1988 and the Offensive Weapons Act 2019 provide guidelines and restrictions on owning and acquiring these weapons.

Ornamental samurai swords, also known as decorative or replica swords, are generally legal to possess in the UK as long as they comply with certain criteria. These criteria include:

1. Blade Length: The blade length should be under 50 centimeters (approximately 19.7 inches) and not have a curved blade. Swords with a curved blade over this length are classified as illegal offensive weapons and subject to restrictions.
2. Public Display: It is illegal to carry or display any sword, including ornamental samurai swords, in a public place without a valid reason. Public display is generally limited to authorized events, performances, or private property.
3. Safe Storage: Regardless of the type of samurai sword, responsible ownership requires safe storage of the weapon to prevent unauthorized access, particularly by minors. It should be securely stored and not readily accessible to others.

It's important to note that laws can change or vary, and it's always recommended to consult official government sources or legal professionals to obtain accurate and up-to-date information regarding the possession and ownership of ornamental samurai swords in the UK. Additionally, when purchasing ornamental samurai swords, it is advisable to engage with reputable dealers or sellers who are knowledgeable about the legal requirements and can provide guidance on compliance with the applicable laws.