Animal welfare protesters hang COP26 banner from DEFRA building

The transcript involves a formal address accusing an individual of trespassing and engaging in actions intended to intimidate, obstruct, and disrupt lawful activities within a building. These actions are said to deter employees from performing their normal duties, thereby affecting the department's operations.

What is the significance of the term 'trespassing' in the context of this text?

In what ways are the actions described as obstructive?