Seoul is 8-9 hours ahead of London. London uses GMT/BST while Seoul uses Korea Standard Time (KST, UTC+9). When it's 9:00 AM in London, it's 6:00 PM in Seoul.
South Korea does not observe daylight saving time, but the UK does. The difference is 8 hours during British Summer Time and 9 hours during GMT.
Best calling time: Early morning in London. 8:00 AM - 9:00 AM London time catches 5:00 PM - 6:00 PM Seoul time, the end of Korean business hours.
Seoul is a global technology and business hub, home to Samsung, LG, and Hyundai. Direct flights from London take about 11 hours. K-pop and Korean culture have significant global influence.