Airports of London cannot be expanded due to the docks on either side. It is also the only airport serving London which does not operate at night. A light rail service from London City Airport DLR station, which adjoins the terminal building of London City Airport, links it to the financial district of the City of London at Bank and Monument stations, which offer interchanges with London Underground. Located in the London Borough of Hillingdon, Heathrow is by far the largest of London's airports and considered the main gateway into the United Kingdom for non-European visitors. Heathrow has four terminals and two parallel
City of London (elections to the Parliament of England) longer a legal requirement, there was a custom that two City seats were filled by Aldermen and two by non-Aldermen. During the Protectorate the City was allocated six seats in the House of Commons, under the terms of the Instrument of Government adopted on 15 December 1653. However, by the time the Third Protectorate Parliament assembled in 1659 the constituency had reverted to its traditional four seats. The "City of London" was a densely populated area in the period up to 1707. The composition of the City electorate was not as democratic as that of some other borough constituencies, such