 In the audition for Rose Gupta the actress noticed that "Deoxyribonucleic acid (DNA)" was spelt wrong in the script and informed Haynes, who immediately decided she was right for the role.The main challenge, according to Haynes, was taking school children and turning them into actors, so they were given acting coaching before filming began.Series 6

Oscar Jacques was confirmed to be playing Tom Tupper; the actor went to six auditions before he was told by the producer that he got the part.