Another top gong for Wigan Athletic collection
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Richardson collected his award from ex-England boss Roy Hodgson at a gala dinner in London on Tuesday evening.
He’d already been named the EFL’s Manager of the Year for the third tier last month.
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Hide AdThe Championship award went to Fulham's Marco Silva, who guided the Cottagers straight back into the top flight, scoring 106 goals as they finished two points ahead of Bournemouth.
Matt Taylor was named the League Two Manager of the Year having taken Exeter up, but just missing out on the title to Forest Green by goal difference.
Chelsea's Emma Hayes was voted the FA Women's Super League Manager of the Year, with Liverpool's Matt Beard claiming the Women's Championship award.
The LMA Service to Football Award went to Manchester United's receptionist Kath Phipps, who has been working at the club for more than 50 years.
QPR's Chris Ramsey and Manisha Tailor received the Kick It Out and Sky Inclusion Champion Award while Dr Sally Harris of HCA Healthcare UK was given the LMA Special Recognition Award.