Hull City have been promoted to the Premier League following a 2-2 home draw against Cardiff City.
Watford, who started the day in third place in the Championship table, lost at home to Leeds and missed the chance to go up to English football's top division automatically.
Gianfranco Zola's team will now compete in the play-offs at the end of the season.
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Chancellor George Osborne will seek to reassure financial markets on Monday morning following Britain's decision to leave the EU.
In his first outing since the referendum result, the lead Leave campaigner has outlined his vision for a post-Brexit Britain.