People who believe they contribute to society are more likely to vote and engage in politics. They were also more likely to donate to and volunteer for political causes compared to individuals who saw their contribution to society as smaller.

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"A lot of stately homes will have that system," says Niki Johnson, fire systems technical adviser for the UK Fire Association, a trade body, and owner of fire detection firm Derventio Fire and Security. "You could be looking at £3-4,000 just to do a corridor." Such installations require substantial pipework, he explains.

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