Opencart Version 18.104.22.168
I have tried going through the instructions for adding the tax from this thread viewtopic.php?t=71088, However having no joy.
I have added the geo location zones, I have added the rates that correspond to that those zones and added the classess as well.
previously this would of worked on a basically copy of the site https://www.whittakertrading.co.uk/
so it is not even showing up when the products are in the categories or on the actual product page itself