By Olivia Wheeler Jeremy Clarkson’s hit series Clarkson’s Farm is launching season three on Friday. However, despite season three not even being released yet, the presenter, 64, has already made a big revelation about series four. Jeremy, his girlfriend Lisa Hogan and farm manager Kaleb Cooper are back in the new season of Clarkson’s Farm, which launches on Prime Video on May 3rd and follows Diddly Squat Farm in Oxfordshire. And now Jeremy has revealed that Clarkson’s Farm is already filming series four. The motor sport expert said: “We’re doing season four now. And every single day when we me…