you need to find cheaper accommodation and/or a job quickly
can yo find enough food to survive on £10 a week? probably... however you'll be really unhealthy (living on rice/pasta) and you will have nothing at all for extras - socialising, clothes, train home, etc - expenses will likely come up at some point in the year whether it's ripping your jeans, shoes wearing out or your laptop breaking, you really need a bit more than the bare minimum