In the UK,there are no alternatives to defending your home with a gun (which you will never be allowed to own anyway !), as it illegal to hurt ,injure,detain,or even mildly inconvenience an intruder,even one who is armed & dangerous.The police in Britain are specially trained to deal,often severely,with those householders who dare to even so much as lay a finger on any intruder,as it a) infringes their "rights" and b) constitutes an "assault" .....yes,just TOUCHING them !! For which you will be arrested,of course.