Additionally, calculating the total surface area of vertical walls in Britain, including building walls and boundary walls according to their directions (north, south, east, or west), is an extremely complex and dynamic task that would require access to extensive datasets, advanced mapping tools, and up-to-date information on the construction and layout of buildings and structures.
Such a calculation would involve considering the surface area of all buildings and boundary walls in Britain, their orientations with respect to the cardinal directions, and the complex shapes and layouts of these structures. It would also require taking into account factors such as changes in urban planning, new constructions, demolitions, and alterations to existing buildings.
If you have a specific project or research in mind that requires this information, I would recommend consulting architectural firms, urban planning authorities, or using specialized geographic information systems (GIS) to get the most accurate and up-to-date data for your analysis. Keep in mind that this kind of comprehensive information might not be readily available, and any estimates would be subject to change over time due to ongoing developments in construction and urban planning.