Delhi is 4.5-5.5 hours ahead of London. London uses GMT/BST while Delhi uses Indian Standard Time (IST, UTC+5:30). When it's 9:00 AM in London, it's 2:30 PM (BST) or 3:30 PM (GMT) in Delhi.
India does not observe daylight saving time, but the UK does. The difference is 4.5 hours during British Summer Time and 5.5 hours during GMT.
Best calling time: 4:00 AM - 12:00 PM London time. This corresponds to 9:30 AM - 5:30 PM in Delhi, covering Indian business hours. Morning calls from London catch afternoon in Delhi.
London and Delhi are connected by direct flights taking about 9 hours. The UK and India share strong historical, cultural, and business ties, with significant diaspora communities in both countries.