Tom W., a reader, noticed this map featured on a BBC News page about the UK family.
One can roughly make out the shape of Great Britain so this is some kind of cartogram.
The title announces that this cartogram concerns the "distribution of population".
In a typical map like this, the redder reds would indicate higher densities of people. Yet, the article tells us that the population is divided evenly into 85 squares, each containing "roughly half a million people over 18 years old".
Instead, we seem to have 500K widowed people next to 500K re-married people (most of whom prefer the coasts, by the way), etc. Apparently, the Brits practise a form of red-lining based on marital status!
The S/M/W/D/R labels are also redundant and very distracting; and the white gridlines interfere with our ability to read the grey boundaries.
Source: "The UK family", BBC News.