Broadcasters have insisted they will push ahead with one debates . Prime Minister has said he will only take part in three seven-way contest . BBC is understood to have backed down from threats to 'empty chair ' him . But to meet strict impartiality rules it could offer the PM his own show . Comes as Labour unveils plan to make election debates compulsory . Leaders would not be forced to attend but debates would always go ahead .
Broadcasters have insisted they will push ahead with three debates . Prime Minister has said he will only take part in one seven-way contest . BBC is understood to have backed down from threats to 'empty chair ' him . But to meet strict impartiality rules it could offer the PM his own show . Comes as Labour unveils plan to make election debates compulsory . Leaders would not be forced to attend but debates would always go ahead .