Look at growth industries and routes. Hugh made a good point, get knocking on doors at media city. As a young man, the very fact that you are comfortable using 'text speak' on a forum, whilst annoying some, highlights an advantage you have... Youth! Look at how you can embrace social media to help you get on, seek out opportunities and even new business ideas. This is probably more relevant today than a letter, but that doesn't mean you should ignore traditional approaches.
Finally, unless you want to be an engineer (and I'm talking in the broadest sense), I would ignore advice to study engineering. I could see the argument when there were studio jobs, as it gave you an advantage and a backup plan, but in 2011? Not convinced.