The description Heather provides of the tarantula hawk, its behaviour and the effect of its sting, is all accurate.
Exterior locations were filmed in Bath, England. Unusually for a film, for the most part the areas through which the two main characters walk are geographically correct.
Heather lives at number 9. Director Guillem Morales also directed episodes of BBC show Inside Number 9.
Based on a 2015 play by Morgan Lloyd Malcolm who wrote the screenplay.