Question: How many UNESCO World Heritage sites in the UK are in the country of citizenship of the author of Birthday Letters?

full_context: Document 1: London: London contains four World Heritage Sites: the Tower of London; Kew Gardens; the site comprising the Palace of Westminster, Westminster Abbey, and St Margaret's Church; and the historic settlement of Greenwich (in which the Royal Observatory, Greenwich marks the Prime Meridian, 0° longitude, and GMT). Other famous landmarks include Buckingham Palace, the London Eye, Piccadilly Circus, St Paul's Cathedral, Tower Bridge, Trafalgar Square, and The Shard. London is home to numerous museums, galleries, libraries, sporting events and other cultural institutions, including the British Museum, National Gallery, Tate Modern, British Library and 40 West End theatres. The London Underground is the oldest underground railway network in the world.
Document 2: London: London is home to many museums, galleries, and other institutions, many of which are free of admission charges and are major tourist attractions as well as playing a research role. The first of these to be established was the British Museum in Bloomsbury, in 1753. Originally containing antiquities, natural history specimens and the national library, the museum now has 7 million artefacts from around the globe. In 1824 the National Gallery was founded to house the British national collection of Western paintings; this now occupies a prominent position in Trafalgar Square.
Document 3: Lyrical Ballads: Most of the poems in the 1798 edition were written by Wordsworth, with Coleridge contributing only four poems to the collection, including one of his most famous works, ``The Rime of the Ancient Mariner ''.
Document 4: Interlunar: Interlunar is a 1984 poetry collection by Canadian author Margaret Atwood. One of her lesser documented works, the collection is divided into two sections. The first, "Snake Woman," explores one of her favorite motifs, the snake. The second section, "Interlunar," deals with themes of darkness. It features a poem "The Robber Bridegroom," that she later used as a title for a novel. Interlunar features several more myths related from a female point of view, including "Orpheus," "Eurydice," and "Letter from Persephone".
Document 5: List of World Heritage Sites in the United Kingdom: There are 31 UNESCO World Heritage Sites in the United Kingdom and the British Overseas Territories. The UNESCO list contains one designated site in both England and Scotland (the Frontiers of the Roman Empire) plus seventeen exclusively in England, five in Scotland, three in Wales, one in Northern Ireland, and one in each of the overseas territories of Bermuda, Gibraltar, the Pitcairn Islands, and Saint Helena. The first sites in the UK to be inscribed on the World Heritage List were Giant's Causeway and Causeway Coast; Durham Castle and Cathedral; Ironbridge Gorge; Studley Royal Park including the Ruins of Fountains Abbey; Stonehenge, Avebury and Associated Sites; and the Castles and Town Walls of King Edward in Gwynedd in 1986. The latest site to be inscribed was the Lake District in England in July 2017.
Document 6: Shakespeare and the Goddess of Complete Being: Shakespeare and the Goddess of Complete Being is a book of literary criticism authored by Ted Hughes. Hughes has extensively discussed the poems and other literary works of Shakespeare in this book. The book is written in three parts:
Document 7: Collection of the National Gallery, London: The National Gallery is the primary British national public art gallery, sited on Trafalgar Square, in central London. It is home to one of the world's greatest collections of Western European paintings. Founded in 1824, from an initial purchase of 36 paintings by the British Government, its collections have since grown to about 2,300 paintings by roughly 750 artists dating from the mid-13th century to 1900, most of which are on display. This page lists some of the highlights of the collection.
Document 8: Milton's 1645 Poems: Milton's 1645 "Poems" is a collection, divided into separate English and Latin sections, of the poet's youthful poetry in a variety of genres, including such notable works as "An Ode on the Morning of Christ's Nativity", "Comus", and "Lycidas". Appearing in late 1645 or 1646 (see 1646 in poetry), the octavo volume, whose full title is "Poems of Mr. John Milton both English and Latin, compos'd at several times", was issued by the Royalist publisher Humphrey Moseley. In 1673, a year before his death, Milton issued a revised and expanded edition of the "Poems".
Document 9: Burnt Norton: Burnt Norton is the first poem of T. S. Eliot's "Four Quartets". He created it while working on his play "Murder in the Cathedral" and it was first published in his "Collected Poems 1909–1935" (1936). The poem's title refers to a Cotswolds manor house Eliot visited. The manor's garden served as an important image within the poem. Structurally, the poem is based on Eliot's "The Waste Land" with passages of the poem related to those excised from "Murder in the Cathedral".
Document 10: Remains of Elmet: Remains of Elmet is a collection of poems by Ted Hughes published in 1979. In this book Hughes has poetically covered the region of Elmet. The book contains black and white photographs by Fay Godwin, taken in the barren hill country of West Yorkshire, Hughes's birthplace.
Document 11: England: English Heritage is a governmental body with a broad remit of managing the historic sites, artefacts and environments of England. It is currently sponsored by the Department for Culture, Media and Sport. The charity National Trust for Places of Historic Interest or Natural Beauty holds a contrasting role. 17 of the 25 United Kingdom UNESCO World Heritage Sites fall within England. Some of the best-known of these are: Hadrian's Wall, Stonehenge, Avebury and Associated Sites, Tower of London, Jurassic Coast, Saltaire, Ironbridge Gorge, Studley Royal Park and various others.There are many museums in England, but perhaps the most notable is London's British Museum. Its collection of more than seven million objects is one of the largest and most comprehensive in the world, sourced from every continent, illustrating and documenting the story of human culture from its beginning to the present. The British Library in London is the national library and is one of the world's largest research libraries, holding over 150 million items in all known languages and formats; including around 25 million books. The most senior art gallery is the National Gallery in Trafalgar Square, which houses a collection of over 2,300 paintings dating from the mid-13th century to 1900. The Tate galleries house the national collections of British and international modern art; they also host the famously controversial Turner Prize.
Document 12: Jones Very: Born in Salem, Massachusetts to two unwed first cousins, Jones Very became associated with Harvard University, first as an undergraduate, then as a student in the Harvard Divinity School and as a tutor of Greek. He heavily studied epic poetry and was invited to lecture on the topic in his home town, which drew the attention of Ralph Waldo Emerson. Soon after, Very asserted that he was the Second Coming of Christ, which resulted in his dismissal from Harvard and his eventual institutionalization in an insane asylum. When he was released, Emerson helped him issue a collection called "Essays and Poems" in 1839. Very lived the majority of his life as a recluse from then on, issuing poetry only sparingly. He died in 1880.
Document 13: Birthday Letters: Birthday Letters, published in 1998, is a collection of poetry by English poet and children's writer Ted Hughes. Released only months before Hughes's death, the collection won multiple prestigious literary awards. This collection of eighty-eight poems is widely considered to be Hughes's most explicit response to the suicide of his estranged wife Sylvia Plath in 1963, and to their widely discussed, politicized and "explosive" marriage.
Document 14: The Love Song of J. Alfred Prufrock: ``The Love Song of J. Alfred Prufrock '', commonly known as`` Prufrock'', is the first professionally published poem by American - born, British poet T.S. Eliot (1888 -- 1965). Eliot began writing ``Prufrock ''in February 1910, and it was first published in the June 1915 issue of Poetry: A Magazine of Verse at the instigation of Ezra Pound (1885 -- 1972). It was later printed as part of a twelve - poem pamphlet (or chapbook) titled Prufrock and Other Observations in 1917. At the time of its publication, Prufrock was considered outlandish, but is now seen as heralding a paradigmatic cultural shift from late 19th - century Romantic verse and Georgian lyrics to Modernism.
Document 15: St. Botolph's Review: St Botolph's Review was the student-made poetry journal from Cambridge University, England in 1956, which saw the first publication of Ted Hughes' poetry, at the launch of which Hughes met Sylvia Plath. The first issue appeared on 26 February 1956.
ground_truth: 17
sub_queries: Birthday Letters >> author Answer: Ted Hughes
Ted Hughes >> country of citizenship Answer: England
How many UNESCO World Heritage sites in the United Kingdom are in England ? Answer: 17