It can be a daunting prospect, getting to know someone. Cousins and birthmarks and old relationships and the songs they like and the movies they hate and the places they like to go to think. It's exhausting. Then all of a sudden the relationship ends and it's like you've learnt a language to a country you're never going to visit again. What use do I have from knowing that one person's favourite colour, or what their . . .

Tanya Wexler’s third film, Hysteria, is about a blossoming romance set in Victorian England. So far, so rom-com. Except, the vibrator happens to be the main character.  Mortimer Granville, an English doctor treating hysteria, invented this small but powerful instrument in 1880. That’s a true story. And Wexler set herself the challenge . . .