MORNING traffic through Potters Bar and Barnet has been delayed and a slip lane closed due to an overturned lorry on the M25.

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A lorry carrying about 18 tonnes of potatoes overturned just after 3am.

The clean up is affecting traffic in St Albans Road and the A1 Barnet By-Pass.

A barrier damaged by the incident will be repaired at a later time, with delays around the roundabout and on the southbound A1M.