Traffic is stuck in a 13 mile queue on the M25 between Waltham Abbey and Enfield because of an accident between two lorries, a fuel spillage and recovery work.
Two lanes are closed anticlockwise between Junction 25 and 26 and cars are now stretching one mile beyond Junction 28.
Travel time is estimated at two hours.
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Barnet Council ran the school, which was an institution for young people with learning difficulties.