i mean, there were -- as we saw, jeremy hunt had that sarcastic reference to his absence and other candidates addressed that empty lectern, but, he, you know, he got away with not being the big issue of the debate. the candidates did actually spend all their time proclaim their own virtues and explaining how they would solve brexit. and boris johnson is going to do it again this morning. he's not going to turn up to be grilled by westminster journalists who have arranged their own on the record hastings and once again all five candidates will be there but not boris johnson. >> right. of course at the start of that televised debate of uk conservative candidates, the announcer drew attention to the empty lectern after boris johnson declined to take part in that debate, but the announcer insisted the invitation still stands and we now know that johnson will take part in a debate on tuesday. why is that debate more important to him than the others?