Workers have been evacuated from an industrial estate on the outskirts of Radlett just after builders found unexploded Second World War bombs.

Police imposed a 100m cordon around the spot in the Parkbury Lane Industrial Estate, Colney Street, at 1.15pm today and bomb squad experts are preparing to carry out a controlled explosion.

Several roads in the area have been closed, and police, who describe the devices as bottle bombs, are advising drivers to find alternative routes.