Transport Secretary Louise Haigh has resigned a day after she admitted pleading guilty to a criminal offence over a work mobile phone.

In a letter to the prime minister, Haigh said she was “totally committed to our political project” but said she believed it would be “best served by my supporting you from outside government”.

Her resignation comes a day after she admitted in a statement that she told police she had lost her phone during a mugging on a night out in 2013 but later found it had not been taken.

She said it was a “genuine mistake” but had been advised by a lawyer “not to comment” during a police interview. The police then referred the case to the Crown Prosecution Service, she said.

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