None anytime soon that are relevant. Because the economic impact of Brexit will only become clear when the regained sovereignty and freedom, away from the unelected totalitarian oligarchy of the EU and Eurozone, has spawned newfound renewal to drive Britain’s sustainability.
Let me remind you of the way we generally measure economic performance is hogwash to begin with.
No number of goals scored in a soccer match can begin to describe the relevant performance of gameplay. Nor does the repetition of the same score in different games suggest identical gameplay. Same with economic performance. No mathematical derivative can be an accurate indicator of human performance, nor is a repetition of such derivative an indication of identical human performance. Such well-socialized myths from the schools of economics form the depravity of reason derived from a systematic confounding of consequence and cause.
Economics must be reinvented for it to produce indicators that are relevant and meaningful. In the meantime, I would suggest you put your faith in any country that holds its freedoms in high regard, the only macroeconomics that can be held responsible for a continued strengthening of the evolution of humanity. With a higher granularity and a plurality of freedom, that is, opposite to a Euro-style commoditization of freedom.