@Shiftlock: I have read the manual. Unfortunately I do not possess an eidetic memory so accessing the relevant information whilst I was walking down the street wasn’t an option. Neither was rereading the manual as it was several miles away tucked away safely in a box in my flat. What I did have access to, after ringing my boyfriend’s doorbell, was the internet and a quick Google search brought me to this page with it’s very helpful answer and your very unhelpful comment. For your information I did try holding the power switch down for an extended period of time. It just wasn’t long enough I guess and as it was beginning to really hurt (cursed side effects of my medication) I had to stop.
I hope your comment doesn’t put other people off from asking questions. Believe it or not, a lot of people don’t have that much experience with electronic equipment.
@The people who posted helpful answers - Thank you.
