Tagging criminals instead of sending them to prison will not stop re-offending, the head of the country's biggest police force has warned.

Sir Mark Rowley, the Metropolitan Police Commissioner, issued a stark warning yesterday about the Government's plans to let tens of thousands of offenders avoid jail.

He said that fewer criminals serving prison time would 'generate a lot of work for police' and a 'proportion' of them would go on to commit another crime.

Sir Mark also accused ministers of having done 'no analysis whatsoever' on the impact of letting criminals dodge jail sentences or be released early.

Under Labour's overhaul of sentencing laws announced last week, some criminals – including violent and sexual offenders – will be released early for good behaviour.