The items, shown for the first time, give a rare insight into the lives of the notorious gangsters behind bars.

The letter provides a rare insight into the aftermath of a partnership collapse.

Her imprisonment provides a rare insight into how such cases came about.

The mythology held that those who ran successful companies were vested with a rare insight and knowledge.

It was a rare insight into the siege mentality that underpins her reluctance to share her unguarded self and fuels perceptions of her as secretive and dishonest.