There are unions that are more important than the European Union or the United Kingdom. For instance, the union between the various wings of the Conservative Party, with the right wing's placation being the reason for Cameron's promise to hold the referendum. Britain will leave the EU, Scotland may leave the UK, but the Conservative Party has held together, so the objective has been successful.
In Labour's case, there are other unions too, that are more important than the EU or the UK. Such as Unite, whose leader (re-elected by a majority of 3000 on a 12.5% turnout) Len McCluskey is a personal ally and sponsor of Jeremy Corbyn, and whose union funds the political group Momentum (formerly Corbyn 4 Labour, and still registered under that name in some places). For Labour, too, as long as Jeremy Corbyn remains party leader, leaving the EU and Scotland leaving the UK is an acceptable price, as long as the core goal of keeping Corbyn leader is achieved. Corbym, of course, supports leaving the EU, as he's done throughout his career. Barring a lukewarm Remain campaign last year, but he reverted to form the day after the referendum.
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