Speaking as someone who lived at home until I was 24.....girl needs to take some responsibility for herself. My parents did everything for both my brother and me and it wasn't what we needed. They weren't teaching us how to take care of ourselves or how to make it in the real world. When they finally kicked us out, it was the best thing they could have done.
Your daughter is only 19, but far better to learn now than later. Sounds like she's not very happy....my judgement....what is she into? Maybe she can go to school to do something she is interested in.
She is also making her problems your problems.....getting rides here and there. I haven't been to the UK but I'm sure there's a bus there.

She needs to feel the consequences of her decisions. If you don't have a job, you don't have a car, you don't have money to go out and do the things you want to do. AND, its not fair for her probs to become probs in your marriage.
Sometimes we all need a good swift kick in the butt to get us in gear. Good luck!!!