Maybe it's because for me it's just locale (UK, en-gb) and not language? I don't know, it doesn't work well for me though.
If Amazon appears in the top 'web' results, it's always amazon.com (not .co.uk) however toggled. The sponsored links in 'shopping' results are always amazon.co.uk & £-figures though, however toggled.
Company websites, airlines, booking systems etc. that I know I'm going to need the /en-gb/ variant of invariably appear in results as /en-us/ URLs.
If Amazon appears in the top 'web' results, it's always amazon.com (not .co.uk) however toggled. The sponsored links in 'shopping' results are always amazon.co.uk & £-figures though, however toggled.
Company websites, airlines, booking systems etc. that I know I'm going to need the /en-gb/ variant of invariably appear in results as /en-us/ URLs.