Guangzhou is 8 hours ahead of London during GMT, and 7 hours ahead during BST. When it's 12:00 PM in London (winter), it's 8:00 PM in Guangzhou. China does not observe DST.
China uses CST (UTC+8) year-round while the UK switches between GMT (winter) and BST (summer). The difference is 8 hours in winter and 7 hours in summer.
Morning London works best! 8:00 AM - 11:00 AM London (winter) corresponds to 4:00 PM - 7:00 PM Guangzhou. Morning calls catch Guangzhou's afternoon.
Guangzhou (Canton) is one of China's largest cities and the heart of the Pearl River Delta manufacturing region. The Canton Fair is the world's largest trade fair.