More late drama gifted his side the three points, thanks to goals from Tendayi Darikwa and new signing James McClean.
Richardson was quick to praise the fans following the victory.
When the fans are here it's just everything," he said.
"You get tired of hearing my voice in the empty stadiums, I'm sure the lads do.
“So to hear the fans singing like that, I thought they were excellent and the scenes at the end there - 711 of them have travelled all the way to London on a Saturday.
"It's not cheap to bring your kids to the football nowadays so to do that to take your time out and support your team is fantastic and if we can give them that impetus and energy to take them home all the way up the M1, thankfully we have done today and there'll be more days like that hopefully."
We have gathered the best of today’s League One rumours below...
When the fans are here it's just everything," he said.