Short answers, pulled from the story.
The name Middlesex means territory of the middle Saxons. This phrase derives from Old English words middel and Seaxe. An Anglo-Saxon chronicle written in Latin recorded the area as Middelseaxan in 704.
Middlesex County Council met regularly at the Middlesex Guildhall in Westminster after 1889. The London Government Act 1963 came into force on the 1st of April 1965. This legislation abolished the administrative counties of Middlesex and London.
The River Thames formed the southern boundary of the county. The River Lea and the River Colne created natural boundaries to the east and west respectively. Much of the south-west boundary followed a gently descending meander without hills.
Radial railway lines built from 1839 caused a fundamental shift away from agricultural supply. Tottenham, Edmonton and Enfield developed first as working-class residential suburbs with easy access to central London. Public transport came under control of the London Passenger Transport Board in 1933.
Nearly all of the historic county area became part of Greater London under the Greater London Council. Eighteen former metropolitan boroughs merged to form seven inner London boroughs including Camden, Hackney, Hammersmith, Islington, Kensington and Chelsea, Tower Hamlets and Westminster. Outer London boroughs formed from the remaining areas included Barnet, Brent, Ealing, Enfield, Haringey, Harrow, Hillingdon, Hounslow and Richmond upon Thames.