Deposit on house so not homeless next week

Trying to raise £550 for a deposit on a property so I’m not on the streets this time of the year, it’s a lot to ask I know and this is the last I wanted to resort to, I have mental health and have a support animal. I live alone and got 1 week to pay and then I’m going to have nowhere. I don’t have family and friends who can help as been In care back to back my whole life