Derry Girls writer Lisa McGee has said there are plans for a film spin-off in the works.The hit Channel 4 comedy could see a new storyline turn into a movie after season 3 has aired, McGee told the Ray D’Arcy Show on RTÉ Radio 1 yesterday (July 20).“For a while I didn’t know if it would work but now an idea is starting to vaguely form in my head,” McGee said.