Warsaw is 1 hour ahead of London. London uses Greenwich Mean Time/British Summer Time (GMT/BST, UTC+0/+1) while Warsaw uses Central European Time (CET/CEST, UTC+1/+2). When it's 12:00 PM in London, it's 1:00 PM in Warsaw.
Both cities observe daylight saving time on the same schedule, so the 1-hour difference remains constant year-round.
Best calling time: 8:00 AM - 5:00 PM London time. This corresponds to 9:00 AM - 6:00 PM in Warsaw, covering standard business hours.
London and Warsaw have strong business ties, especially following Poland's EU membership. A large Polish community lives in the UK. Direct flights connect them in about 2.5 hours.