The 459 districts are labelled for identification in the preceding alphabetical list. Lines link the centres of circles connecting districts which are contiguous.
The width of the lines is in proportion to the strength of the contiguity. Notice that the vast majority of previously contiguous districts are still touching each other, even in difficult cases such as the cluster around Glasgow city (number 156) or Birmingham (number 33). These topological connections were used to pull the cartogram into its present shape. Topology is usually only broken where it would be impossible to maintain, for instance, to the tiny old City of London from the boroughs which surround it (numbers 64, 196, 361, 403 and 438).