The person writes a will leaving the flat to you.
They do a letter of wishes saying why they have done what they have done and explaining the work that you have done on it. The letter of wishes is not part of the will and is not attached to it, but kept with it.
You need a letter of intent confirming what the person is doing for you so that if they decide to change their will without telling you, you can produce the letter because then you have a claim in estoppel.
Promissory Estoppell. This is a technical legal doctrine not used very often. It says that if anyone has been promised something during the lifetime of a person and they relied on that promise to their detriment then they are entitled to have whatever was promised. The classic case is indeed the young man on the farm, who is told by the old man “don’t go off to seek your fortune son, but stick with me and work on the farm and I will leave it to you when I die,”.
So the young man doesn’t go off to seek his fortune and stays and works on the farm and it turns out that when the old man dies he leaves everything in his estate to the prize cow, Daisy or his new girlfriend, who is 30 years younger than he is.
In that case, the young man having given up a future (to his detriment) on the basis that one day (he was promised) the farm would be his and he believed it and relied on it, he can get a court order that the farm is transferred to him. Such claims are not cheap or quick to bring in do require a large burden of proof of the promise and reliance to detriment.
There is also Proprietary Estoppel. Another technical legal doctrine, not used very often which is similar but it’s not in respect of the promise but in respect of a reasonable expectation. So you live with someone in the house is in their name and you do a whole load work on the house (act to your detriment) on the expectation that when the other person eventually pulls off the mortal coil, you would have a shared of it.
The difference between Promissory and Proprietary is that Promissory is based upon an expectation arising from a promise and the other one is an expectation arising from actions.
Thank you for letting me assist you with your legal question. I am glad that I was able to help.
I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
It will be my pleasure to help you again either further with this or any future questions you have