A friend of my wife's did it and while I didn't really absorb any details...I think it's time dependant. I vaguely seem to remember the trust had to be set up 6 years before death for it to stick.
I learned to my regret how different the quality of care can be..and that's greatly dependant on whether it's self funded or local authority funded.
My mum (not a home owner but she had significant savings) booked herself into a private place (they advertise on TV) locally, £1500 a week and thoroughly enjoyed it (although nice as it was, the reality didn't match the glitz of the advert...but still very nice)
Then she started to worry about her savings disappearing and virtually demanded she come home.
We quickly realised, once home, we had become her carers and she was completely incontinent, ruining bedding and her chair , it quickly became a bit of a nightmare.
We asked the LA for help finding a place now her savings were quite severely diminished...and she ended up in another LA fundednplace...and it was a whole different world . The staff were really good but the facilities were not and the smell of incontinence was strong.
We/she had dug ourselves a pit...she passed away shortly after but she should really have enjoyed her last days in comfort and nice surroundings.
I wouldnt wish LA funded care on anyone if her experience is typical. It may be once she ran out of money in the nicenplace..she'd have been shipped out anyway, we never got to ask that question.
Lots of regrets and sadness over how it panned out.
But, be aware, as someone gets into their 90s, particually if theyve lost mobility, become chairbound and incontinent to boot, their care becomes almost full time, you can't do as we were, popping in once or twice a day, doing the laundry, cleaning, cooking, it's exhausting and all encompassing. I guess if you lived in it's do-able but don't underestimate how much care an 80 or 90 year old needs (unless you're very lucky)