Thank fuckBang on. Rees Mogg emphasised that's the only Advice (capital A) that the Queen can take (even if he has no majority). He sent just three ministers to Balmoral - it seems not even all the cabinet knew.
At least Boris seems to be able to command some control over leaks.
If this had been a year ago - Beth Rigby would have received the news live on air whilst Cabinet was still in session