*The best way is to use the geopy library to use nominatim in a Python script
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*Geocoding script with Nominatim: https://github.com/eric-pommereau/demo-geocoding-using-nominatim
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*To check geocoding accuracy, it is best to make a pivot table of all cities in the target country, and to add a lookup function in the main data file. Adding the name of the country in the address usually lead to better results.
*Local Authorities List in UK http://localweblist.net/
*Local Authorities List in UK http://localweblist.net/