The "materials, tools" part is fairly standard in the U.S. (I believe the OP is in the UK, though, correct?). The "knowledge" part is overbroad. If knowledge

The "materials, tools" part is fairly standard in the U.S. (I believe the OP is in the UK, though, correct?). The "knowledge" part is overbroad. If knowledge were replaced with "Company's confidential information," then that would make sense and is standard. Your employer has a legitimate interest in your not using their trade secrets and confidential information for your own use. But everyone gains "knowledge" working at a job. Whether it's learning a programming language, being introduced to a publicly available tool or service, we all learn things of general applicability at our jobs. Come on - why do employers ask for people with X years experience, other than the fact that they understand people learn things from their working experience? So, yes, this is unreasonable and I wouldn't sign it, unless amended.