It would surely take a superhuman gang of villains to have the strength to steal a 30-tonne Stonehenge stone from rural Somerset.

But nevertheless, volunteers have reportedly been put on high alert after French crown jewels worth £76million were stolen from the Louvre in Paris last month.

English Heritage, the charity which manages the historic site, is now giving staff ‘hostile reconnaissance training’ to ensure thieves stand no chance of getting away with another daylight robbery.

The ancient stone circle – believed to have been built 5,000 years ago – was estimated to be worth £51million in 2010.

But exactly how one might lift the stones remains a mystery.

Charity bosses now want volunteers at the site to take a course that issues guidance on ‘how to recognise suspicious behaviour’

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