VAT covers far more items that Purchase tax ever did. And its creates a massive burden on business tracking input and output VAT. A sales tax would only happen at retail so a massive cut in admin.VAT just replaced sales tax, different name, same thing
VAT has crept into many areas, like domestic fuel since inception. And the EU wants us to put it on food and childrens clothes if we remain a member. Most EU27 countries charge VAT on everything.