The parishes and major newer settlements in the Hundred. For some years until c.1880s reforms Northolt and Hanwell enjoyed small detached parts (exclaves). As to Northolt, in Greenford lay a small exclave and enclave of agricultural land, the smaller of which was 2.5 acres (expanded on map as too small to show), the larger, 47. Cowley completely consisted of enclaves in Hillingdon parish. Its parcels have therefore given way to a more workable modern definition, Cowley Peachey close to the site of its main manor.

Non-geometric map of the county engraved by Wenceslaus Hollar (d.1677). The manors and villages shown are those seen as most notable. Not confined to those with a church, many of the then-largest estates or simply estates of greatest houses have become obsolete.

The name is a standard contraction in Old English of El(ɘ's) thorn – El likely being a man, perhaps one of the eorls (earls) in the same way as Spelthorne Hundred, adjacent, and the thorn would accurately reflect that most of the land, like Hounslow Heath of today, until and unless manually cleared was covered or underlain as it naturally is here with hawthorns, blackthorns and brambles. The most distinctive of these is the sometimes tree-height genus, the hawthorn, which is in warm months heavy with small white flowers and is endemic to the local gravel-rich soil and banks of rivers across all England save for the north and south-west, where its larger type also extends to. Blackthorns are alongside hawthorns the ancient underlayer of the local Ten Acre Wood, an oak plantation. Antiquaries have suggested a meeting-point tree, in the same way as Ossulstone was a meeting point, however, in the same way as "broom" and "gorse" are used whether the noun refers to single thorn tree is unascertainable.

It was a north-west portion having these parishes:

• Cranford, and Harlington and West Drayton small parishes north of the south-west projection, Harmondsworth
• Harmondsworth, the far south-west projection. It as such covered most of the fields and former homes of Heathrow (hamlet) taken up to become London Heathrow Airport
• Greenford, between Northolt and Perivale in the east
• Hanwell, a strip parish east of Norwood Green.
• Hayes, the south-east half of which was Norwood, a precinct from the founding of its 12th century chapel, then chapelry until its 1859 upgrade to a parish, during the early centuries seeing its Southall manor build up significantly and build its own community. The first mention of a priest in the precinct of Norwood is of Simon, the chaplain of Southall, in 1394.
  • Yeading developed late in the county in the north of Hayes proper (outside of the precinct). It saw its first mission church in 1890.
• Hillingdon, a large area, a fairly neat upright rectangle. The western parish with the main indent of the Colne, a braided river.
  • Cowley, a parish scattered about in Hillingdon parish
  • Uxbridge, a chapelry from before 1248 until an 1827 upgrade to a parish. It centred on the town in the west
  • Yiewsley, a chapelry founded on an old hamlet in 1859, made a parish in 1874
• Ickenham, a small parish north-east of Hillingdon and north-west of Hayes
• Northolt between Ruislip and Hayes
• Perivale, narrowly the bulk and extreme of the small eastern sub-projection
• Harefield, with Ruislip the northern projection
• Ruislip, with Harefield the northern projection. Parent parish of Eastcote and Northwood.

It thus closely corresponded to the present London Borough of Hillingdon, plus the western half of the London Borough of Ealing. The eastern third of Ealing is mainly Ealing and Acton which lay in Ossulstone Hundred.

Major roads and housing estates have simplified the borders of localities — as shown on each local street name sign in these boroughs. The complexity of many old parish borders of Elthorne hundred has been reduced. This is seen in the modern borders of the local Church of England ecclesiastical parishes, radically simplified. As to the smallest of old parishes most boundaries have greatly changed particularly Ickenham which has shifted west. Local councils have not gone so far as to redefine street signs on the basis of equal-electorate electoral wards. They locally take heed of a fusion of long history, wards and numbered postal districts.

• UB postcode area, a similar area but which excludes Ruislip and its progeny (particularly Eastcote and Northwood, see HA postcode area). Most of the UB numbered divisions are loosely based on the original parishes, redrawn for post service convenience. Harmondsworth by the 20th century attached to other Middlesex areas, such as the Staines Rural District which existed from 1894 to 1930. London Heathrow airport which took much of its area as well as parts of Hatton (a hamlet of East Bedfont) and Stanwell is in the TW postcode area under Hounslow post town.

References

Notes

51°32′N 0°24′W / 51.54°N 0.40°W / 51.54; -0.40