Question: What comprehensive school was established on the island where Talwrn is found?

full_context: Document 1: Pengorffwysfa: The village lies on the crossroad between Penysarn and Porth Eilian and Point Lynas Lighthouse, with turnings down towards Amlwch Port and Amlwch town, and the ascent for Llaneilian Mountain and heading towards Dulas Bay. This road forms part of the National Cycle Network Route 566, known as the Copper Trail, taking in the north coast of Anglesey that is designated an Area of Outstanding Natural Beauty, and the nearby remains of the historical copper mines at Parys Mountain.
Document 2: Comprehensive school: Gibraltar opened its first comprehensive school in 1972. Between the ages of 12 and 16 two comprehensive schools cater for girls and boys separately. Students may also continue into the sixth form to complete their A-levels.
Document 3: Comprehensive school: In Ireland comprehensive schools were an earlier model of state schools, introduced in the late 1960s and largely replaced by the secular community model of the 1970s. The comprehensive model generally incorporated older schools that were under Roman Catholic or Protestant ownership, and the various denominations still manage the school as patrons or trustees. The state owns the school property, which is vested in the trustees in perpetuity. The model was adopted to make state schools more acceptable to a largely conservative society of the time.
Document 4: Comprehensive school: Comprehensive schools are primarily about providing an entitlement curriculum to all children, without selection whether due to financial considerations or attainment. A consequence of that is a wider ranging curriculum, including practical subjects such as design and technology and vocational learning, which were less common or non-existent in grammar schools. Providing post-16 education cost-effectively becomes more challenging for smaller comprehensive schools, because of the number of courses needed to cover a broader curriculum with comparatively fewer students. This is why schools have tended to get larger and also why many local authorities have organised secondary education into 11–16 schools, with the post-16 provision provided by Sixth Form colleges and Further Education Colleges. Comprehensive schools do not select their intake on the basis of academic achievement or aptitude, but there are demographic reasons why the attainment profiles of different schools vary considerably. In addition, government initiatives such as the City Technology Colleges and Specialist schools programmes have made the comprehensive ideal less certain.
Document 5: Dwynwen: Dwynwen is believed to have been a daughter of King Brychan Brycheiniog, who lived in the 5th century. Her mother may have been Rigrawst. Dwynwen lived in Anglesey, and her name is still recalled in place names such as Llanddwyn and Porthddwyn in Wales and the church of "Sen Adhwynn" in Advent, Cornwall.
Document 6: St Caian's Church, Tregaian: St Caian's Church, Tregaian, also known as St Caean's Church, Tregaean, is a small medieval church dating from the 14th century in Anglesey, north Wales. It is dedicated to St Caian, a Christian from the 5th or 6th century about whom little is known. The building contains a late 14th-century east window and a late 15th-century doorway. The churchyard contains the grave of William ap Howel, who died in 1581 at the age of 105, leaving over forty children between the ages of 8 and 89 and over three hundred living descendants.
Document 7: Comprehensive school: In these schools children could be selected on the basis of curriculum aptitude related to the school's specialism even though the schools do take quotas from each quartile of the attainment range to ensure they were not selective by attainment. A problem with this is whether the quotas should be taken from a normal distribution or from the specific distribution of attainment in the immediate catchment area. In the selective school system, which survives in several parts of the United Kingdom, admission is dependent on selection criteria, most commonly a cognitive test or tests. Although comprehensive schools were introduced to England and Wales in 1965, there are 164 selective grammar schools that are still in operation.[citation needed] (though this is a small number compared to approximately 3500 state secondary schools in England). Most comprehensives are secondary schools for children between the ages of 11 to 16, but in a few areas there are comprehensive middle schools, and in some places the secondary level is divided into two, for students aged 11 to 14 and those aged 14 to 18, roughly corresponding to the US middle school (or junior high school) and high school, respectively. With the advent of key stages in the National Curriculum some local authorities reverted from the Middle School system to 11–16 and 11–18 schools so that the transition between schools corresponds to the end of one key stage and the start of another.
Document 8: Raising of school leaving age in England and Wales: In 1944, Rab Butler introduced the Education Act 1944 which amongst other changes, including the introduction of the Tripartite System, included raising the school leaving age to 15. Although the act should have been brought into effect as from September 1939, it was not implemented because of the effects of World War II, but was eventually enforced from April 1947. The comprehensive school system has since replaced the Tripartite System brought in by this act across most of England. This act also recommended compulsory part - time education for all children until the age of 18, but was dropped, in similar fashion to the 1918 Act, to cut spending after World War II.
Document 9: Bryn, Neath Port Talbot: Bryn "(English: Hill)" is a village and community in Neath Port Talbot County Borough in Wales. It has a population of 913. The village is located in the hills between Cwmafan, in the Afan Valley, and Maesteg in the Llynfi Valley, approximately from Port Talbot and from Maesteg. The name of the village now familiarly 'Bryn', is Bryntroedygam. So wrote the first vicar of St Theodore's in Port Talbot. There was a farm situated above Meadow Row named Bryn-Troed-y-Garn as shown on the 1876 OS map, as many more immigrants came to 'Bryntroedygam' it seemed the name of the village was to be shorted to Bryn. 12% of the village (112 out of 913 people) speak Welsh.
Document 10: Lady Rose McLaren: The Paget family (the Marquesses of Anglesey) resided in Plas Newydd and Beaudesert in Staffordshire until the house was demolished in 1931, due to financial difficulties.
Document 11: Comprehensive school: The largest expansion of comprehensive schools in 1965 resulted from a policy decision taken in 1965 by Anthony Crosland, Secretary of State for Education in the 1964–1970 Labour government. The policy decision was implemented by Circular 10/65, an instruction to local education authorities to plan for conversion. Students sat the 11+ examination in their last year of primary education and were sent to one of a secondary modern, secondary technical or grammar school depending on their perceived ability. Secondary technical schools were never widely implemented and for 20 years there was a virtual bipartite system which saw fierce competition for the available grammar school places, which varied between 15% and 25% of total secondary places, depending on location.[citation needed]
Document 12: Llaneugrad: Llaneugrad is a community in the Welsh county of Anglesey. It is located on the east coast of the island, south east of Amlwch, north west of Menai Bridge and north east of Llangefni, and includes the village of Marian-glas. At the 2001 census the community had a population of 273.
Document 13: Talwrn: Talwrn is a small village on the Isle of Anglesey, an island off the coast of north Wales. Talwrn is most notable for the Grade II-listed 16th-century manor house of Plas Llanddyfnan, which lies just to the north of the hamlet. Plas Llanddyfnan is a Queen Anne manor house from the early 18th century. Plas Llanddyfnan was owned by seven generations of the Griffiths family.
Document 14: St Mary's Church, Llanfair Mathafarn Eithaf: St Mary's Church, Llanfair Mathafarn Eithaf is a small medieval church in Anglesey, north Wales. The earliest parts of the building, including the nave and the north doorway, date from the 14th century. Other parts, including the chancel and the east window, date from the 15th century. It is associated with the Welsh poet and clergyman Goronwy Owen, who was born nearby and served as curate here. He later travelled to America to teach at The College of William & Mary, Virginia.
Document 15: Comprehensive school: The first comprehensives were set up after the Second World War. In 1946, for example, Walworth School was one of five 'experimental' comprehensive schools set up by the London County Council Another early comprehensive school was Holyhead County School in Anglesey in 1949. Other early examples of comprehensive schools included Woodlands Boys School in Coventry (opened in 1954) and Tividale Comprehensive School in Tipton.
ground_truth: Holyhead County School
sub_queries: Talwrn >> located in the administrative territorial entity Answer: Anglesey
What comprehensive school was established in Anglesey ? Answer: Holyhead County School