Oslo is exactly 1 hour ahead of London year-round. When it's 12:00 PM in London, it's 1:00 PM in Oslo. Both cities observe DST on the same schedule.
Norway uses Central European Time (CET/CEST) while the UK uses GMT/BST. The 1-hour difference remains constant throughout the year.
Perfect overlap! 9:00 AM - 5:00 PM London corresponds to 10:00 AM - 6:00 PM Oslo. Full business day overlap with just 1 hour difference.
Norway has significant business ties with the UK in oil & gas (North Sea), shipping, and seafood. Norwegian, SAS, and British Airways operate frequent flights between the two capitals.