Is it cheaper to buy designer things in China compared to a city like London?

I am planning on buying cosmetics from brand names like YSL or Dior, but is it actually going to be cheaper to buy (real) cosmetics there than it would be in London?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).