A year ago, at about eight o'clock in the evening, I left my flat to go and visit my boyfriend. I took my car, a battered 12-year-old Peugeot 205. I pulled over at the end of my road to buy a bottle of wine from the off-licence, on Acre Lane in Brixton, a real hotspot for muggings. I dashed across the road, made my purchase and got back into my car, placing my handbag on the passenger seat.