Tax avoidance is the legal utilization of the tax regime to one's own advantage, in order to reduce the amount of tax that is payable by means that are within the law. By contrast tax evasion is the general term for efforts to not pay taxes by illegal means

as for the EU as indicated, if i buy within the UK i pay the UK Rates, if I buy from another country I pay their rates.

as for the UK, If I currenly breath freshair I am taxed on the basis i might one day be ill, if i earn money i am taxed, if i save the money I earn I am taxed again, if i spend money I am taxed any number of Sales, Excise Duty, Road tax, Roll charges, parking charges, new car tax, council tax, or "value added tax" (apparently food and heating is a luxuary and is subject to VAT) - i would pay more taxes but the public utility companies were nationalised thus I dont pay tax as these are now private services... of course private services are taxed.

if i die I am taxed again on any money I have or have saved and was previosuly taxed when initially earnt the money, then on any gains and then I am taxed again when i die