UK and EU negotiators will begin a final push to salvage chances of a post-Brexit trade deal after Downing Street warned the gaps between the two sides remain “very large”. Boris Johnson and European Commission president Ursula von der Leyen held crunch talks over dinner in Brussels on Wednesday aimed at breaking the deadlock, yet key differences prevail. The leaders agreed to make a “firm decision” about the future of the talks by the end of the weekend, and asked their chief negotiators Lord Frost and Michel Barnier to reconvene in the city on Thursday.