Tory leader hits back at NHS 's Andrew Marr after interview on live TV . Marr twice said the PM told a magazine foxhunting is his favourite sport . Presenter has admitted mistake , insisting it was a 'cock up not conspiracy ' Cameron climbs on to wooden pallet to address party faithful in Yorkshire . But he was heckled by a factory worker who said the 'NHS is dying '
Tory leader hits back at BBC 's Andrew Marr after interview on live TV . Marr twice said the PM told a magazine foxhunting is his favourite sport . Presenter has admitted mistake , insisting it was a 'cock up not conspiracy ' Cameron climbs on to wooden pallet to address party faithful in Yorkshire . But he was heckled by a factory worker who said the 'NHS is dying '