As some people may have realised, there were few Brazil nuts in their shells available in UK shops at Christmas 2004. The EU decided that every imported batch must be tested for aflatoxins, a carcinogenic fungal contaminant.
Predictably UK supermarkets simply could not be bothered to fund the tests, so that was the end of Brazil nuts in shells for this Christmas. Surprisingly nuts grown in France, like walnuts, almonds and hazelnuts were not included in the EU directive.