It appears there is a sense of cautious optimism among UK officials in Brussels that a breakthrough over the Irish backstop just might be on the horizon.
Theresa May will be arriving tomorrow to hold talks with Jean-Claude Juncker on the Brexit state of play. And Geoffrey Cox, the Attorney General, is also due to present new "technical details" on clarification to the backstop, in a move geared at reassuring MPs that it will be temporary.
The nature of those technical details is shrouded in secrecy. But UK sources in Brussels say that, politically speaking, the details may be immaterial.
Instead, the key requirement is that Mr Cox feels comfortable returning to Westminster and telling MPs that he no longer has reservations about the backstop.