Clapton isn't commenting, but Christie's watch expert Michael Friedman explains that collectors frequently "downsize and reformulate their collections, " which is precisely what Clapton is doing.

FORBES: Slow Second Hand

The main objective is to guarantee quality assurance of services by tracking the results of the activities and using the information to reformulate actions, tools and trainings.

UNESCO: Country Profile: Angola

Nutritionist Amanda Ursell said introducing legal limits on food could be "incredibly useful" if it meant "manufacturers are encouraged to reformulate their products" and market in "a responsible way".

BBC: Consider tougher regulation in obesity fight - Labour

The most iconic example is the Coca-Cola Company's attempt to reformulate the world's most popular soft drink on April 23, 1985 - "a day that will live in marketing infamy", according to the company's website.

BBC: The recipe rage problem

The second is to reformulate the product.

FORBES: Beefing Up the Brand