Kostic v Chaplin & Others [2007] EWHC 2209 (Ch), [2007] All ER (D) 119 (Dec)
The deceased, B, made wills in 1971 and 1974 and a codicil in 1984 leaving his estate to his only son, Z. Those wills were apparently revoked by subsequent wills created in 1988 and 1989 in which B left his entire estate, worth £8.2m, to the Conservative Party Association (CPA). It was common ground that B had, from about the mid-1980s, suffered from a delusional disorder, believing that “dark forces” were conducting a “sinister and highly organised international conspiracy” against him in which various family members, including Z, were implicated. Part of B’s delusions involved him believing that only the Conservative Party, through the agency of Margaret Thatcher, could save the country from such dark forces.