Leaves, stems, roots and microorganisms in the potting mix also act as a filtering system.

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In my potting room, I am "in my element, " as my husband says, and everyone knows not to disturb me.

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Sotheby's said the bowl is a "remarkable and exceptionally beautiful example of Song pottery, celebrated for its thin potting, fine near-white body and ivory coloured glaze".

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But O'Sullivan responded with the first century of the match, and after Maguire had grabbed another frame back with a run of 57, the favourite roared to victory with another fluent display of potting.

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The organisation says those at risk range from a 1920s chemical silo in Billingham and lime kilns at South Shields, to a greenhouse with a potting shed in County Durham and Britain's first ever bird research station in Northumberland.

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Run by full-time chairman Richard Tims, 43, the oldest football team in the world has gone from its humble beginnings in a Sheffield potting shed to a club of three senior teams, 13 junior teams, a women's team and one disability team.

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Is his long-potting a speciality?

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