Hi. Generally the contractual restraint of trade is prima facie unlawful and invalid. There are some circumstances to justify them. It depends on what kind of work you are doing, whether you have close connection with the client, etc. And also, it depends on whether, without the restraints, the employer will lose the business connection which he is entitled to preserve as his own. Even there is such business connection, the restraints of time and location needs to be reasonably necessary. Also, even if it is reasonable, you will be released from the restraint if the restraint is against the public interest. Common law doctrine, quite complicated.