One-time MotoGP podium finisher Folger has deputised since the Catalunya race, but has found his time in the class difficult, failing to score points at any of the five races he has contested.
Smith races for the SRT team in the MotoE World Cup under the One Energy Racing banner, and sits second in the standings following podiums at the first two rounds in Germanyand Austria.
“Honestly, it’s going to be quite strange to jump onto a Moto2 bike for the first time since 2012, because the championship has changed quite a lot,” said Smith, who is yet to ride the new Triumph-powered Moto2 machines.
“I’ve followed the changes very closely with the new engine and a little more torque and power, but it’s still going to be very different for me.
“I’m excited for the opportunity though! I had a fantastic time last year at the British Grand Prix, qualified really well, and missed out being able to race in front of the fans, so to be able to turn up for my home race again will be amazing.
"My target for the weekend is to have fun, to do the best I can, and to come away on Sunday with something to be proud of.
“I’ve got no idea how it’ll work, having to learn a bike, a track and tyres on a normal GP weekend, but it’s something I’m very excited for.”