Which areas in UK have highest and lowest earnings?

Using data from the Annual Survey of Hours and Earnings (2017), I have built a map of weekly earnings across the UK. In the interactive map below you can scroll over specific areas. 

When looking at earnings by where employees live, those in Kensington and Chelsea had the highest median gross weekly income (£862), while those in West Somerset had the lowest (£407).

The map was built in Tableau.