For the very first civilisations and also our own, the yellow lustre of gold is the most alluring and intoxicating colour of all. From the midst of pre-history to a bunker deep beneath the Bank of England, Dr James Fox reveals how golden treasures made across the ages reflect everything we have held as sacred.

When, in the Middle Ages, the precious blue stone lapis lazuli arrived in Europe from the East, blue became the most exotic and mysterious of colours. And it was artists who used it to offer us tantalising glimpses of other worlds beyond our own.