London is exactly 1 hour behind Vienna year-round. When it's 3:00 PM in Vienna, it's 2:00 PM in London. Both cities observe daylight saving time on the same schedule.
Austria uses Central European Time (CET) while the UK uses Greenwich Mean Time (GMT). The 1-hour difference remains constant throughout the year.
Any business hours work great! With only a 1-hour difference, 9:00 AM - 5:00 PM London corresponds to 10:00 AM - 6:00 PM Vienna. Full business day overlap.
Vienna is a major center for classical music, international organizations (UN, OPEC), and banking. The 2.5-hour flight from London makes it easily accessible for European business travel.