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From reading pg 29 of the "updated technical background to the CLEA Model" SC050021/SR3, the text says "An important judgement for the risk assessor is whether the household is able to grow its own fruit and vegetables in the garden and what sized garden is required to grow the default amounts used by the CLEA model. Applying the consumption rates in Table 4.17 to a household of two adults and two children, the required garden area could be as little as 20 m2 (see Box 3.2 for a summary of this calculation and Section 3.2.6 for further information)." I assume the writers mean a plot of 20 square metres (i.e. 4x5m) rather than plot of 20 metres squared (20x20m). Slightly pedantic i know.