Why did Oliver Hoare, a leading London art dealer, invoice the world’s biggest collector Sheikh Saud Al-Thani of Qatar for massive overcharges? “On one occasion Mr Hoare invoiced Sheikh Saud £5.5 million for a jade pendant originally made for Shah Jahan. Ten months earlier the same object had sold at Sotheby’s for £454,500. Mr Hoare’s invoices are now being examined by Qatari authorities as part of the investigation into Sheikh Saud’s spending.”