There isn't one- we call it the 'City of London', the City, or The Square Mile, but it's actually an intersection of City of Westminster, Camden, Tower Hamlets, Islington, Hackney, Southwark and Lambeth. http://en.wikipedia.org/wiki/London_borough#Map
London Borough of Islington, about 4 miles northeast of central London.
Romford is in the London Borough of Havering and lies about 15 miles northeast of Central London.
Tulse Hill is in South London in the London Borough of Lambeth and is about 6 miles from central London.
The London borough of Enfield is the most northern London borough.
Houses of Parliament and lords in Westminster, London.
London Borough of Croydon was created in 1965.
The London Borough of Greenwich.
Ilford is an area of northeast London in the London Borough of Redbridge.
No. The district of Dulwich is in the London Borough of Southwark.
New Malden is a town within the Royal Borough of Kingston-upon-Thames, and it is a suburb of Central London, so technically it is a "part" of London.
They are in the London Borough of the City Of Wesrminster
It is in the city of Westminster which is a London borough.