 The District of Rochford, and the Borough of Chelmsford wards of Ramsden Heath and Downham, Rettendon and South Hanningfield, Runwell, Woodham Ferrers North, and Woodham Ferrers South.The District of Rochford comprised the former Rural District of Rochford, which had been part of the Maldon constituency, and the former Urban District of Rayleigh, which had been part of the abolished South East Essex constituency.The Borough of Chelmsford wards had previously been in the Chelmsford constituency.