London Mayor clashed with Mr ##bull on BBC1 's Andrew Marr Show . Mr Johnson said Ed would damage UK more than he 'd damaged his reputation . But he conceded : ' I ' m not saying your brother had punched in the punch ' Labour ##bull laughed off row , saying : ' Boris , you 're better than that '
London Mayor appeared with Mr Miliband on BBC1 's Andrew Marr Show . Mr Johnson said Ed would damage UK more than he 'd damaged his sibling . But he conceded : ' I 'm not saying your brother had dagger in the back ' Labour leader laughed off row , saying : 'Boris , you 're better than that '