They financially assessed her and found me liable to contribute.
Elleherd. This is total bollocks. Social services lie. And this looks like a whopper of one. You can not by law be liable for any other adult. Dependent DC only.
Yes to the losing tenancy part if she's in a home. But so what? If she's homeless and in a care home but doesn't need to be, she won't be assessed as needing to stay there and will get discharged to be homeless and go down the council's homelessness route, being discharged into temporary accommodation once that's found. Literally, she either needs to be in a care home or she doesn't. So dumping relatives in care is bullshit.
More likely people's relatives need to be in care and the family achieve it by pushing for respite care, then when the old person loses their tenancy they're assessed as needing to stay in care home because that's where they should have been all along. Family get forced to care for relative because social services lie and say no help available. Family won't see them suffer, which is the only alternative.
If family don't help, person suffers and social services will have to admit the person has unmet needs so provide help. If family help, social services say the needs are being met so won't help. Family need respite because they were never in a position to take on the care anyway and are now on their knees with regards to their own health. Person goes into care home, family who can't cope say "enough, no more". If relative comes out social services have to fund care package, so relative is assessed as needing to stay in care home because that's cheaper/more practical than providing the care they need in the community.
A fait accompli only in the sense of forcing social services to do their job! Legally family can't be forced to care for or pay for other adults. Social services lie about this. I'm glad you're getting legal advice. There's no way you should be paying the care home fees.
People lose their tenancy by either not paying rent, because they're in the care home and their housing benefit is paying for that (or being in care home makes them ineligible for housing benefit, I'm unsure which), so their home is taken back by landlord. If they're in social housing, regardless of if they're rich and paying rent plus care home fees, if they're long term ie months living elsewhere eg hospital etc, their property will be taken back under abandonment terms, so someone can live in it.
If aunt was eligible for any benefits it's likely that she would be needing to use those to mostly pay for care with little left for herself, so you'd have been funding the flat/house if you wanted to keep it going for her, I think. (I could be wrong there about how much money she'd have left over). But no way in hell are you liable for care home fees. And no legal obligation to keep flat going if you didn't want to either.
Are you her carer? Insist on a carer's assessment. That's an assessment of your needs, not aunts. You need rest after hospital and help with your own hoarded house that's causing tenancy issue with complaints (and unhealthy?). You are literally in danger of working yourself to death. You're definitely working yourself into illness that's how you ended up in hospital in the first place. Overdoing it. You need to stop work in aunt's house, to prevent your physical health deteriorating. You need to sort out legal situation of what you've signed because you're paying something you weren't otherwise liable for (made your self liable by signing, I think). You need advocacy. Those are your needs, from what I can see. At the moment social services are dumping on you from a great height. They should be helping you instead. Not lying to a vulnerable adult (you, your medical condition and current state of health means you can't think straight, from what you've posted here) to get you to sign something making you liable for care home fees. Very shoddy behaviour of them. So get a carer's assessment and get your needs documented, get whatever help you can. I'm so sorry you're in this situation 💐 sorry if I sound stroppy, I'm angry with them on your behalf. I hope the legal person can help you extricate yourself from this situation.
Your aunt going into a care home should never have be dependent on you signing up to be guarantor on her flat.(I know that's not what you've signed). For a start, that's for the landlord to decide if they need a guarantor, which they obviously don't if she's currently renting it. That would be sorted out before tenancy took effect. Social services can't alter the tenancy or decide it needs a guarantor! It's nothing to do with them. They've tricked you into signing something that says you'll privately fund the care home fees. Again, she either needs care home or doesn't, so you shouldn't have ever had to sign.
Hope some of this information helps you