Although it is usually tucked away from sight, Zsuzsi Starkloff still wears the same necklace every day.

A chain carrying a signet ring carved with the letter 'W’, it is the legacy of a love affair which unfolded nearly half a century ago.

It changed her life – and if things had turned out differently it may well have changed the course of history too.

The 'W’ stands for Prince William of Gloucester, the Queen’s cousin and a handsome young royal who was fourth in line to the throne.

I felt guilty for not going, that somehow things would have been different if I had been by his side