Indeed - one of the more annoying things for me is Google and friends giving me UK-centric results because my browser language is set to en-GB despite being log

Indeed - one of the more annoying things for me is Google and friends giving me UK-centric results because my browser language is set to en-GB despite being logged in, with a US billing address and a US IP address. United Airlines is actually the worst offender for this - they constantly revert pricing to GBP. They somehow manage to know which home airport to set though.