Exposing its consignors to a global audience, thereby bypassing depressed markets, is one of Ritchie's strengths.

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This is a big advantage over smaller auctioneers and brokers when presenting consignors with an appraisal.

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Consignors and sellers often wish to remain anonymous, and few private collections have been published.

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As you know, we work diligently to verify to the best of our ability the representations of consignors on every vehicle we offer for sale.

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"Although there are no legal issues whatsoever regarding the sale of lots six and seven by Banksy, FAAM convinced its consignors to withdraw these lots from the auction and take back the power of authority of these works, " he said.

BBC: Banksy artwork taken in north London withdrawn from sale