There may have been a Time-Turner in the building at the BAFTA TV Awards in London on Sunday night as “ Harry Potter ” stars past and present collided at the ceremony. On the red carpet, Jason Isaacs , who played Lucius Malfoy in the original movie series, posed alongside Lox Pratt , who is set to play Draco in the upcoming HBO adaptation. Lox was at the ceremony to present the awards for children’s non-scripted and children’s scripted alongside his “The Lord of the Flies” co-star Winston Sawyers. In a recent interview with Variety he said: “I’m excited for people to see it because he’s so different to how Draco was in the films.” Also on hand were Nick Frost and Paapa Essiedu, who have been cast as Hagrid and Severus Snape, respectively. They jointly presented the award for best supporting actress to “Adolescence” star Christine Tremarco.…