It is to do with me personally ,because i paid taxes in the uk and receive a uk pension, and i like many other taxpayers who live abroad have a valid interst in how the country is run.
like many others i pay tax on everything i buy,in the country i live in, and when i visit the uk pay tax on what i buy then.
i alsp pay direct interest tax on any savings i have in the country i live in, if i have any savings.
so i pay tax in two countries.That is fair IMO