London is exactly 1 hour behind Berlin year-round. When it's 3:00 PM in Berlin, it's 2:00 PM in London. Both cities observe daylight saving time on the same schedule.
London uses Greenwich Mean Time (GMT) in winter and British Summer Time (BST) in summer, while Berlin uses Central European Time (CET) in winter and Central European Summer Time (CEST) in summer. The 1-hour difference remains constant.
Any business hours work well! With only a 1-hour difference, 9:00 AM - 5:00 PM London corresponds to 10:00 AM - 6:00 PM Berlin. Full business day overlap.
London and Berlin are Europe's two largest financial centers, with constant coordination in banking, insurance, and regulatory matters.