retained. The resulting South Glamorgan was the only Welsh county council the Conservatives ever controlled (from 1977 to 1981). One of the effects of the Act was to confirm the area of Monmouthshire as part of Wales. Ambiguity as to the status of Monmouthshire had been introduced by legislation in the 16th and 17th centuries, and by the gradual cultural anglicisation of some eastern parts of the county. By the late 19th century the area was often treated in legislation as one with Wales, using the terminology "Wales and Monmouthshire", although it remained legally part of England. Apart from the new Glamorgan authorities, all the names of the new Welsh counties were in the Welsh language, with no English equivalent. With the exception of Clwyd (which was named after the River Clwyd) the names of the counties were taken from ancient British kingdoms. Welsh names were also used for many of the Welsh districts. There were no metropolitan counties and, unlike in England, the Secretary of State could not create future metropolitan counties there under the Act. The Act After much comment, the proposals were introduced as the Local Government Bill into Parliament soon after the start of the 1971–1972 session. In the Commons it passed through Standing Committee D, who debated the Bill in fifty-one sittings from 25 November 1971, to 20 March 1972. The Act abolished previous existing local government structures, and created a two-tier system of counties and districts everywhere. Some of the new counties were designated metropolitan counties, containing metropolitan boroughs instead. The allocation of functions differed between the metropolitan and the non-metropolitan areas (the so-called 'shire counties') – for example, education and social services were the responsibility of the shire counties, but in metropolitan areas was given to the districts. The distribution of powers was slightly different in Wales than in England, with libraries being a county responsibility in England—but in Wales districts could opt to become library authorities themselves. One key principle was that education authorities (non-metropolitan counties and metropolitan districts), were deemed to need a population base of 250,000 in order to be viable. Although called two-tier, the system was really three-tier, as it retained civil parish councils, although in Wales they were renamed community councils. Within districts some inconsistency prevailed. For example, in Welwyn Hatfield District in Hertfordshire, which comprised Welwyn Garden City, Hatfield and Old Welwyn, Hatfield retained a civil parish