Before the two-window transfer system as we know it today, top-flight clubs were allowed to trade players throughout the season up until March 31, after which point it was deemed that signing reinforcements could potentially undermine the integrity of the run-in.
Together the Big Six have spent over £1.83 billion in the winter window to date, with Chelsea as the biggest spenders (£628.94 million) and Manchester United as the most frugal (£179.65m) overall.
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