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But he has taken a step to bringing the American buyers back and in the window of his chic shop at 46 Bourne Street, off Pimlico Road, SW1 is a bold sign saying: “American Clients. To help you and us, the exchange rate for items purchased in this gallery is $1.60 to the pound.”

Mr Von Moltke is working on the principle that it is better to do a deal than not to do a deal, and, after the first week, the sign has engendered plenty of interest.

At this stage the sign has not resulted in any direct sales – but it did bring in two American decorators who would otherwise not have bothered.

A good move, but it seems the Pimlico dealer is not the first to put up the sign.

I hear that for some time the same offer has been in the Sloane Street, Knightsbridge, gallery window of the renowned dealer in things maritime Paul Mason.