I was getting this wrong before. Gordon Brown wouldn't be allowed to put forward a Queen's Speech unless he could go to the Queen with a reasonable chance of getting one through. If the Queen asks him if he has the votes (which she will have to do fairly soon) and he says no (one presumes he will not be permitted to lie) then he will be forced to resign, and the Queen will pop the same question to David Cameron. If Clegg has turned him down and Cameron asks for the chance to put forward his Queen's Speech anyway, the Queen will probably feel forced to give him a go, and the Lib Dems will probably not dare vote it down. Without a proper deal with the Lib Dems though, and considering the bad blood that this brinkmanship will cause, Cameron would still be looking at fresh elections pretty soon, and his term would be purely political theatre aimed at securing a majority second time around. Basically everything that happens between now and our next elections will be posturing and blame gaming, and the second campaign will be an endless succession of party leaders protesting that it's not their fault.