I am SO sorry for the position you find yourself in OP, and also for the amount of flack you've received from people on here, who obviously don't have a clue how bad things are out there. I know a couple who having lived in a flat for several years, were served notice because the elderly owner wanted to sell up. Because they'd had debts previously and had been advised to take up a debt repayment scheme, no landlord would touch them, unless they had a Guarantor, which they also struggled to get, due to their previous bad debt. The fact that they both have well paid jobs, made not a bit of difference, and they've ended up living in a really grotty area, in a pretty grim flat, but are incredibly thankful to even have that, so I for one, understand how difficult this situation is for you.
I'm afraid I don't have any really useful ideas for you, but would perhaps suggest that once you've started your new job, you could maybe ask among your new colleagues, if anyone has a room they'd be willing to let, to a friend of yours. Then if anyone says yes, and you feel they can be trusted, you might feel able to fess up and tell them it's for you. As an aside, do you have anyone who would be prepared to act as Guarantor if you do find the CCJ is a problem? It might be worth talking to parents if they're around, just in case?