The women returned home last month, and claim they're still having to take antidepressants to cope.
Consular staff, both in London and China, assisted the detainees and their families in the UK, to the best of their abilities.
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The entertainer was held for the murder of Stuart Lubbock, who was found dead in his swimming pool in 2001, but never charged.
Although the diamond was believed to be cut in the 19th Century, its history and how it arrived at the car boot sale is unknown.