Thousands of prisoners across the country are turning their jails into some of the most species-rich sites in the country and a newly found interest in conservation is aiding their rehabilitation. The country's 140 prisons include nine internationally recognised sites of special scientific interest (SSSIs) as well as two European special areas for conservation and an internationally important wetland.

Some of the important habitats are on land that is outside the prison walls, but in many cases threatened species such as barn owls, kingfishers, adders and slow-worms also reside at Her Majesty's pleasure within prison grounds.

Dr Phil Thomas, sustainable development manager for the prisons estate, said the organisation is stepping up its work on biodiversity. 'It's really paying dividends, because many SSSIs on our estate are really in good condition,' he said. This is partly to meet the Prison Service's obligations under the 2006 Natural Environment and Rural Communities Act, which requires it to consider the impact of its operations on plant and animal life. But Thomas says the work also benefits the community and makes prisoners less likely to reoffend.

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