Danny Hargreaves led the team at Real SFX to produce the special effects on the episode, while Milk VFX supplied the visual effects. The teams previously won a BAFTA Cymru award for their work on the 50th anniversary special, The Day of the Doctor.
Both teams took to Twitter to celebrate the news:
#realsfx @MilkVFX won @BAFTACymru for @bbcdoctorwho !! One very happy @realsfx team!! pic.twitter.com/hpIqQfdndG— Danny Hargreaves (@Dannysfx) October 2, 2016