London is 3-4 hours ahead of Buenos Aires. London uses GMT/BST while Buenos Aires uses Argentina Time (ART, UTC-3). When it's 12:00 PM in Buenos Aires, it's 3:00 PM (GMT) or 4:00 PM (BST) in London.
Argentina does not observe daylight saving time, but the UK does. The difference is 4 hours during British Summer Time and 3 hours during GMT.
Best calling time: 12:00 PM - 8:00 PM London time. This corresponds to 9:00 AM - 5:00 PM in Buenos Aires, covering Argentine business hours.
London and Buenos Aires are connected by direct flights taking about 13 hours. Both are major financial centers with historical ties and significant business exchange.