Jacob Seelochan, who plays Harris and whom the character is based on, wrote in Harris correcting Vanessa when she says he's Polish rather than German. A week before the film was released Jacob found out from his grandparents that he is in fact Polish.
All but 3 of the cast & crew trained at The Royal Central School of Speech & Drama.
The film was shot in one day, a week before the Covid-19 lockdown began in the UK.