Investigate discrepancy between GeoJSON and Gov.uk data sets

[practicalli-johnny]

The local area district names may be different in the GeoJSON to those used in the Gov.uk data set

• Compare GeoJSON ids from each data set
• [[https://geoportal.statistics.gov.uk/datasets/counties-and-unitary-authorities-december-2017-full-extent-boundaries-in-uk-wgs84/geoservice][ONS GeoJSON export file with different outfields]] and test with Vega-lite