During the next year the value of the average British home may depreciate 19%, or about $1,100 a week, to an unadjusted total of $237,386 by September, and they probably will not recover for a decade, according to the property derivative broker Tradition Financial Services.

Forward contracts suggest that the average home price will fall 38% from its peak in August of last year, to a low of $210,853 by September 2011, Tradition Financial Services, a unit of the Paris financial brokerage Viel & Cie., said last week.

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