It is a truth universally acknowledged, that should you ever get my father onto the subject of migraines, he is guaranteed to say two things. The first is that he worked on the advertising campaign for Migraleve. The second is that if you have a migraine you should eat celery as it will make you pee, and thus relieve the pain. Although I have several limp sticks at the bottom of my fridge, I can’t quite face chomping through one just at the moment. If that changes I’ll let you know.