Mumbai is 5.5 hours ahead of London during GMT (winter), and 4.5 hours ahead during BST (summer). When it's 9:00 AM in London, it's 2:30 PM in Mumbai. India does not observe DST.
The time difference shifts by 1 hour when London switches between GMT and BST while Mumbai stays on IST (India Standard Time, UTC+5:30) year-round.
Afternoon Mumbai works! 1:30 PM - 4:30 PM Mumbai corresponds to 8:00 AM - 11:00 AM London (winter). Good overlap for business calls.
Mumbai and London share deep historical ties. Air India and British Airways operate multiple daily flights. Strong connections in finance, diamonds, and the Indian diaspora in the UK.