On the 2nd October 1991 the Department of the Environment issued Directions, safeguarding ten strategic views within London. These protected views are of St.Pauls Cathedral and the Palace of Westminster as seen from a number of high vantage points about the London basin.

Reference:
Westminster City Council Unitary Development Plan - Protecting important views.
House of Commons Memorandum - consultation on strategic views in London.

Any new development or alteration which falls within a 'viewing corridor','wider setting consultation area' or 'background consultation area' will be assessed for any effect that it may have upon a strategic view.At Waterslade we can determine what part of a site is located within a corridor and taking into account the curvature of the earth and refraction of light by the atmosphere to what height that part of a development may be limited.

Strategic Views map:

Strategic views may not only be limited to these instances, they may also be required to determine the aesthetic effects of development in other circumstances. We can create visual representations in the form of 3d computer generated models or photo-montages.