Readiness to take on a fake identity also helps; he has twice impersonated a wealthy collector to obtain information on a painting.

Some sceptics hold that it was bought by a wealthy collector of curiosities.

She would then sell a painting at a discount to a wealthy collector.

Most were sold to other museums or wealthy collectors.

Classic cars with muscular engines and sleek, timeless designs are being given an added attraction by wealthy collectors - battery power.