Rent Some Will, Some Won't (1970)

In his will, arch-prankster Henry Russell (Wilfrid Brambell) charges his four beneficiaries to justify their legacies of £150,000 each; the conditions he sets are calculated to make them step completely out of character, and prove themselves as human beings. When the four report back to the executor, they have all changed for the better. But Henry still has a surprise in store for them...