If I type '1 pint' into Spotlight, I am told that this is equivalent to 0.47l. This is true for US units, but I am in the UK, where a pint is 0.57l. Many other imperial units, such as the gallon, are different in the UK, so this isn't a problem exclusively with pints.
I frequently make quick conversions using Spotlight for cooking and brewing, but have only recently realised that the system is set to use US unit measurements.
As far as I know, all my regional settings are set to UK, but I must have missed something somewhere. How do I tell Spotlight to use British measurements?