It is 1989 and a seemingly invincible Prime Minister has sacked Geoffrey Howe, her Foreign Secretary. She apparently had nothing to fear from him: his speaking skills had, famously, been compared to those of a dead sheep. But, a year later, inspired by his wife Elspeth - whose relationship with Thatcher was notoriously frosty - Howe overcame his limitations to destroy Mrs Thatcher with one of the great political speeches. Dead Sheep...