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Absolutely true, but farmers would need some form of positive incentive to persuade them not to grow crops or grub hedges and trees out to make more efficient use of their land. They operate on a £/acre basis and if any scheme awards them less than they could gain by 'improvements' they will improve away. The logical extension of this is that only the poorest land will ever be set aside.
We don’t need game birds to justify woodlands, hedges, headlands and crops set aside for wild birds.