Take for example the following clause: "You must only use the Company’s property, including but not limited to computers, email, internet, intranet, instant messaging software and fax, for the sole purpose of fulfilling you employment duties to the Company. Any unauthorised or inappropriate internet, intranet or email use is strictly prohibited and failure to comply with these provisions may be treated as serious misconduct"
I'm pretty sure that it isn't enforced quite that strictly and that it has just been added into the contract boiler plate. Is it worth challenging clauses like this or is it best just to ignore them since the chance of it having an effect is minimal and challenging clauses may make you look difficult?