May today said
Quote "It was actually £39bn, said Mrs May, and this was a country "that honours it's legal obligations and we will do exactly that", before leaving herself a little wiggle room with her familiar mantra that "nothing is agreed until everything is agreed".
Source
https://www.bbc.co.uk/news/uk-politics-45887830
And I'm not implying this is a legal document, as I thought we owed nothing on the no deal scenario...