Thanks every one. I will definitely try the 'environmental' and 'ladies privacy' angles.

However, as is so often the case, when I asked the guy who collects our rent if anyone else had contacted him regarding sheds he said no one else had spoken to him about them. All those plot holders that expressed a wish to site a shed on their allotment have gone quiet making it look as though I'm the only one making a noise.

I will have to try and galvanise them but don't want to be treading on anyones toes.

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It is the doom of man, that they forget.