I know I really ought to be preparing an answer to the question "where do you see yourself in five years time?", but I'm slightly distracted because I've just had a search engine hit for the phrase 'which shops in lewisham can you buy drinking poison?'. I'm currently fifth on Google for that.
Admittedly if I lived in Lewisham I'd want to kill myself too, but can I just say that it's not worth it, and you should always try to look on the bright side of life.
Although if you've made your mind up, I'd try Boots.