I believe again that this is usually done by placing it in trust I believe this wouldn’t work as a route to avoid care fees as she would be named as a beneficiary of the trust (and therefore would have access to as much as was needed for her care), or if she paid full market rent, which would make it blatantly obvious it was an attempt at deprivation of assets.
My mum was advised to do this by her financial adviser as a way to reduce inheritance tax. Was this some time ago? It was common to split the house, and when the first person died, by their will or by a deed if variation, leave the children a share of the house not exceeding the IHT allowance. Then when the survivor died, they had their own IHT allowance to put against their estate. I can’t see that has any advantage now the law has been changed so that the first to die can pass their IHT allowance to the survivor, so their are two IHT allowances to put against the estate.
Otherwise it could seen as "deprivation of assets", which is illegal I’m not sure it’s illegal, what happens us probably worse, that they assess you as if you still have the money. So if you are down to £23k because you’ve given your house away, they’ll find out (they can look back as far as they like, there’s no 7 year cut-off), find out you owned a house you gave away, treat you as if you’ve still got the house, and assess you as being a self funder with no LA contribution. What happens next in practical terms I don’t know. The money’s got to come from somewhere.
The only way to do it properly would be for mum to pay market value rent to her own children for living in her own rent. Otherwise it would be claimed to be deliberate reduction of assets That would just exacerbate the deprivation of assets, first she’s deprived herself of the asset of a house, now she’s making further deprivations by paying rent. The paying full market rent advice is in relation to IHT. As long as she’s living at low or no rent in a house she has given away, it’s a GRoB - a gift with reservation of benefit - and will still be treated for IHT as if she’d never given it away.