arvilles of Windsor English Breakfast Tea in Box of 25 Individually-Wrapped Tea Bags. Now, maybe you and the Queen of England can drink the same English Breakfast Tea. Perhaps there is no better company to make English Breakfast Tea than Darvilles of Windsor, holders of a Royal Warrant. The Royal Warrant means the company supplies goods to the UK Royal Household. The Royal Warrant is a recognition of quality and service. Darvilles first obtained the Royal Warrant from King George VI in 1946. Darvilles is one of the oldest companies to hold a Royal Warrant. English Breakfast Tea is always a popular choice. Darvilles English Breakfast Tea is a a traditional favorite. To make this tea, Darvilles blends tea leaves from India's Assam region, Ceylon and East Africa. This tea has a full-bodied taste, which makes it ideal for the morning. But, it is also good any time of day.