Hi Dave, I believe the term is "reasonable force" and it could only be attempted murder if he was intentionally trying to kill the person, which is in the hands of the CPS or Procurator Fiscal. You could get away with a kick to the head if the person down was still an threat and the attack would remove the threat. e.g. the person was armed or intending to get up and attack again. The unfortunate problem is, it is down to the perception of the Judiciary. However, members of the police, armed forces and prison service are held to a higher standard and would not be given the benefit of the doubt. Also remember there is a big difference to a fight in a busy street at rush hour and a dark park at midnight. The Bear.