@mpjgregoire
Phrases like "a Downing Street source" or "someone close to the PM" always means it is precisely the PM, but he doesn't want to be quoted on it.
BoJo is currently playing the blame game. When the no-deal exit happens (as it is 99% likely to now) he can blame Juncker/Merkel/Varadkar/whoever, anyone but himself and his predecessor.