
Both my in-laws have dementia and are in different homes, each paying about £500 per week. This is in Solihull. You have my sympathies as it is a horrible thing for relatives to go through (worse, I think, than for the sufferer, as both my in-laws seem happier than they have even been). The upset was made much worse in my partner's case because of all the arguing he and his brother had to do with social services, doctors and hospitals, and with the company that owns one of the care homes threatening to throw my mother-in-law out because it took so long to go through the court of protection process (neither had set up an enduring power of attorney, so my partner and his brother had to apply to the CoP to get guardianship of their parents so they could pay the fees, which took 14 months in the case of one parent, and is still ongoing with the other).
Your aunt will be entitled to attendance allowance (£67 pw at the higher level, which I would think she is at by the sounds of things) and, of course, her pension could be used towards the cost of care. Depending on how much this is and how much rent you envisage paying, you might find that it's possible to keep the house. My partner and his brother are thinking of renting out their parents' flat rather than selling it. I believe (though I may be wrong) that you are not obliged to sell until after the person's death, so it might - in the present climate - be better to hang onto it if you can.