Doha is typically 3 hours ahead of London. When it's 12:00 PM in London, it's 3:00 PM in Doha. Qatar uses AST (UTC+3) year-round.
During UK summer time (March to October), the difference is 2 hours. During UK winter time, Doha is 3 hours ahead of London.
Good overlap! 9:00 AM - 3:00 PM London corresponds to 11:00 AM - 5:00 PM Doha (UK DST) or 12:00 PM - 6:00 PM (UK winter). Morning London catches afternoon Doha.
Qatar Airways operates one of the world's best business class routes between Doha and London. Qatar Investment Authority has significant UK real estate holdings.