Rejoining the European Union is again a live topic in the United Kingdom, but the hurdles are daunting, says Matthew Brooker for Bloomberg Opinion. LONDON: Rejoining the European Union is again a live topic of UK debate , a decade after Britain voted to leave.  Reversing Brexit would be a mistake. That’s not because the decision to leave was correct; at this point, it’s indisputable that withdrawal damaged the economy, as well as doing obvious harm to the UK’s diplomatic relationships and