In the United Kingdom, the laws regarding the carrying of knives, including fixed blade knives, are quite strict. As a general rule, it is illegal to carry a fixed blade knife in public without a valid reason. The law considers fixed blade knives to be offensive weapons, and carrying them without lawful authority or a reasonable excuse is a criminal offense.
The UK's legislation regarding knives is governed by the Offensive Weapons Act 2019, which sets out various restrictions on the possession and carrying of bladed articles, including fixed blade knives. The act prohibits carrying a knife with a blade length exceeding 3 inches (7.62 cm) in public places, with certain exceptions such as for professional use or religious purposes.
It's important to note that the specific circumstances and intentions can influence the interpretation of "reasonable excuse" or "lawful authority." For instance, carrying a fixed blade knife for work-related purposes (e.g., as part of your profession) or for specific activities such as camping, fishing, or other lawful outdoor activities might be considered lawful. However, carrying a fixed blade knife for self-defense purposes is generally not considered a valid reason.
If you are uncertain about the specific laws and regulations regarding knives in the UK, it is advisable to consult official government sources or seek legal advice to ensure compliance with the law.