Ravinder Bhogal heads for the shores of Lake Kariba in Zimbabwe to question the ethical problems with exporting the region's tilapia fish to the UK when many native to the country are on the brink of starvation. Jay Rayner puts in a hard day's work at a dairy farm to discover whether the price of milk is too low, and the show's food fanatics visit Laverstoke Park Farm to take part in a taste test. .
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