A phone service to help protect women travelling alone has been described as a "plaster" by critics who say the solution to male violence is not further surveillance of women.

The proposed service would allow people to use an app or dial or text 888 to trigger GPS tracking. It would give an expected journey time, with automatic alerts sent to emergency contacts such as friends and family if the person fails to reach home by the given time.

BT chief executive Philip Jansen has pioneered the idea after being filled with "outrage and disgust" at the murders of Sarah Everard and Sabina Nessa.

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