Knowing what was to follow, the venue was apposite.
Seeing the sultry Mirren, elegant Rigg and saucy Dench in their gossamer frocks could turn even the most reluctant of us onto Shakespeare.
She also starred in the 1997 adaptation of Rebecca, which won her an Emmy Award.
It features a series of celebrities being interviewed in light-hearted fashion.
Diana is renowned the world over via her role on the hit '60s series The Avengers, where the tall, broad-shouldered actress played Mrs.
Towards the end of her career, she kept acting in important work like Game of Thrones where she played Olenna Tyrell.