This isn't a tax matter, although we tax specialists will care about it. It's a case where what seems to have been a valid Will has been overturned by the Courts. The beneficiaries who have lost out (charities) are appealing against that decision.
The animal charities Blue Cross, RSPB and RSPCA in Ilott v Mitson, a case relating to an inheritance dispute, have been granted permission to appeal to the Supreme Court. The Inheritance Act case made headlines in July last year when the Court of Appeal ruled that the deceased’s daughter would be awarded £143,000 to buy a house (plus expenses) and an extra £20,000. Mrs Jackson (the deceased) and her daughter, Mrs Ilott, had been estranged for 26 years after Mrs Ilott left home aged 17 to live with, and later marry, a man whom her mother did not approve of.