Why has my olive oil gone solid?Updated 22 days ago

That's actually a sign of good-quality olive oil. Below 5C, you may start to see solid white flecks form on top of the oil, and if it's exposed to temperatures below 5C for an extended period, it may turn thick or solid in the bottle. No need to worry, just leave the oil somewhere warmer for a few hours and it'll return to liquid, ready to pour.