A police officer may use as much force as is necessary to arrest you. Unreasonable force is assault. After arrest, a police officer may handcuff you if you attempt to escape or the officer considers it necessary to prevent you escaping. A judge or magistrate will decide whether or not the force used was reasonable in the circumstances. It is an offence to resist arrest.
Active resistance is required for a charge of resisting arrest to be laid.
Lying down and refusing to co-operate is not resisting arrest. Police may arrest you if they reasonably believe you have committed an offence, even if, in fact, you are completely innocent. If you resist arrest, you are committing an offence with which you may be charged, even if the police do not charge you with any other offence. Police officers have the right to search you, without a warrant, immediately after arresting you or later if you have been charged. Police can request you to accompany them to a police station for questioning but you are not required to go unless you have been arrested for an offence.