Hi Joe Morris,
If you have the postcodes, you should be able to make it work.
A great lecture as well; UK I know: Filled UK Postcode area map
An two examples for other countries:
- New Zealand - Filled maps at postcode level for New Zealand
- Germany - Filled Maps for German ZIP-Code?
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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If i follow these steps i just get an empty map with a message in the bottom right saying 680k unknown.