 In 1891 it was decided to build the new County Hall at Kingston, and the building opened in 1893, but this site was also overtaken by the growing London conurbation, and by the 1930s most of the north of the county had been built over, becoming outer suburbs of London, although continuing to form part of Surrey administratively.In 1960 the report of the Herbert Commission recommended that much of north Surrey (including Kingston and Croydon) be included in a new "Greater London".These recommendations were enacted in highly modified form in 1965 by the London Government Act 1963.