Credit card unemployed UK?

Ok so, my friends sister is renting out a flat, the rent is cheap and since I'm unemployed at the moment she'll accept housing benefit, but she wants �900 upfront, no1 I know has that kind of money to lend me so I was thinking of loans or a credit card, just use it for that then cut it up so as not to use it for anything else and just pay off the payments, but I'd need one that will still give me a card or loan [even though the APR will be high since I'm unemployed] I should be starting a job by the end of the month but by the time I get paid the flat will be gone, so I need a card or whatever that has an interest free period or one that you don't have to start paying right away, any ideas??