Village after village, families told how they had fallen into debt after being persuaded to buy GM seeds instead of traditional cotton seeds.

The price difference is staggering: £10 for 100 grams of GM seed, compared with less than £10 for 1,000 times more traditional seeds.

When crops failed in the past, farmers could still save seeds and replant them the following year.

But with GM seeds they cannot do this. That's because GM seeds contain so- called 'terminator technology', meaning that they have been genetically modified so that the resulting crops do not produce viable seeds of their own.