Last Halloween’s news that lawyers for Warner Bros wrote a ‘cease and desist’ letter to Ms Marmite Lover, a single Mum in the UK, who was planning to host a Harry Potter themed dinner party (complete with butterbeer and pumpkin soup) received worldwide media coverage, perhaps focussing on the irony of the former single Mum, JK Rowling, seeking to restrain another single Mum from eking out an existence or just being the "fun police". However the story raises some interesting questions: Can you ho