The RSPCA recently lost a High Court appeal over a legacy. The RSPCA had been left a £2million legacy, but the daughter of the woman who died contested the will and won.
This has raised serious concerns among charities, since it is always presumed that when you die, the wishes in your will unless unreasonable, will be carried out. But one certain way of avoiding this is to make a 'living legacy'. I.e. make a donation while you are still alive, as not only does this guarantee it being implemented, but you can often be involved in ensuring the money goes where you want it.
In the case of a bequest to the World Land Trust, you can actually help select the land you want to leave to the world; you can visit it, or send your represenative, perhaps a son, a daughter or a grandchild, to go and see it. You can help set up the long term management. If you want to know more, give me a ring, I will be delighted to talk to you about it.