Many a slip twixt antique cup and lip

Imagine hearing that the antique silver cup you sold in a provincial auction for £4,000 had just sold in a London auction for £456,000. That's what happened to one unlucky punter this week, but what would you do? Sob or sue?
Click here to read all about how an exceptionally rare early 17th century globe cup made by Dutch silversmith Pybe Wouters turned to gold.