WTO Article 24. That is all.Some of us interpreted the rhetoric as meaning that a deal would be sought, not that a deal would be guaranteed. What is often lost is that 'No Deal' is still a deal, albeit one that the EU do not want. They want the UK to remain part of the EU both to prop up the EU's internal economy and to lend the whole enterprise credence.
Leaving with 'No Deal' simply means that we are in the same position as we were before joining - able to make our global trading and laws deals free from EU legislation.
Carry on as you were, potentially for ten years until deals are in place.