England recognised it in 1328, then preceded to ignore it when it suited them until 1707, when the two nation joined each other in the United Kingdom.
Unlike the Irish and Welsh, we joined, we werent coerced.
Yet the Act of union is kind of like the joining of many countries to the EU — the majority of the population were against it —> Sir George Lockhart of Carnwath, the only member of the Scottish negotiating team against union, noted that “The whole nation appears against the Union” and even Sir John Clerk of Penicuik, an ardent pro-unionist and Union negotiator, observed that the treaty was “contrary to the inclinations of at least three-fourths of the Kingdom”