For anyone who gets bored on a nice day in London or wants to go blackberry picking, I thoroughly recommend a stroll along the Parkland Walk. It's a former rail line that ran between Finsbury Park and Alexandra Palace. Over the course of which are the remains of a number of bridges, two platforms and two very large tunnel entrances, which though fenced off, lead into Highgate's abandoned overground station.
In more unfortunate news, I have managed to catch the dreaded swine flu. So will be spending the next few days locked away indoors, drinking Lucozade and swallowing Tamiflu. Boo-hiss-cough-splutter.