More than £8m of public money spent on subsidies for former PMs

Annual cost of allowance has more than doubled in recent years because of quick turnover of prime ministers

More than 8m of taxpayers' money has been spent on funding the public lives of former prime ministers over the last three decades, a Guardian analysis has found.

All former PMs are able to claim up to 115,000 a year - until the end of their lives - in a subsidy to enable them to contribute to public life after they have left Downing Street.