Paris is always 1 hour ahead of London. When it's 9:00 AM in London, it's 10:00 AM in Paris. Both cities observe DST on the same schedule, maintaining the 1-hour difference year-round.
London uses GMT/BST while Paris uses CET/CEST (Central European Time).
Business hours overlap almost completely! 9:00 AM - 6:00 PM Paris corresponds to 8:00 AM - 5:00 PM London. Easy scheduling with just 1-hour offset.
Paris and London are Europe's two largest financial centers. Eurostar takes just 2h15m between St Pancras and Gare du Nord, making same-day business trips common.