An air ambulance has been called to the scene of a crash which has closed the M1 northbound near Luton.
The accident involving two cars and a lorry happened just after 7am between junctions 10 and 11.
There is congestion backing up to junction 7.
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An appearance in support of Labour by television cook and Canaries shareholder Delia Smith has had to be cancelled and another scaled back.
Outbreaks of rain, perhaps thundery, clearing northwards during the morning, then a mainly dry day with a chance of showers following.
Rain spreading north tonight and perhaps thundery at times, but a drier day tomorrow with minimum temperatures of 10 deg C