Williamson moved to defending champions Manor Competition for the 2010 season, again as part of a four-car team with Will Stevens, Thomas Hylkema and Josh Mulholland, with Ollie Millroy replacing Mulholland during the season.
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Williamson took further wins at Croft and Silverstone – a rescheduled race from Brands Hatch which Williamson had qualified on pole for – as he and Blomqvist commenced their battle for the championship along with Tamás Pál Kiss and Will Stevens.
Cat Stevens | Wallace Stevens | John Paul Stevens | Sufjan Stevens | Ray Stevens | Stevens Institute of Technology | Shakin' Stevens | George Stevens | Even Stevens | Andrew Stevens | Risë Stevens | Brinke Stevens | Stevens Point | Chase Stevens | Stevens | John Stevens | Connie Stevens | Thaddeus Stevens | Ted Stevens | Stevens County, Washington | Mark Stevens (actor) | Mark Stevens | Stevens T. Mason | Shadoe Stevens | Michael Fenton Stevens | John Stevens Henslow | John Stevens (drummer) | John L. Stevens | John Cox Stevens | J. Christopher Stevens |