Ok, so this time I'm using https://www.tableaumapping.bi/ properly. I connect using the web connector from tableau Public to https://www.tableaumapping.bi/wdc and chose the Post code Sector table. I then blend in my own data with post code addresses. I use a calculated field to generate the sector from the full post code in my data:
left([postcode],len([postcode])-2)and voila! a much more detailed map than the one I got before using only the first half of the postcode.
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