The rats chew plastic to help wear their teeth down as they are continually growing and the plastic tastes sweet to them. Perhaps if they eat enough of it, they will experience the same feminisation that befell trout is some of your local streams I remember hearing about (plastic manufacture waste effluent containing an estrogen-like compound, as I recall), causing reproduction difficulties.
I should like to visit Horncastle, BTW.
IIRC the predominant oestrogenic component was found to be oestrone and oestradiol from (particularly pregnant) women, not other effluent. Oh, and also something to do with rising temperatures, fish apparently intersex over temperature.
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If that's the case, why would anyone in their right mind want a 'staycation'? Unless, of course, it involves staying away from Horncastle.
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Looks quaint - although I don't much care for Sherry, leave her out of the Trifle, please.