I have known this video for some years. Quite a style. The need for educating a broader public to make better tea was of great importance at times of war, particularly it was at that time that the whole England was under imminent stress of attacks from the continent. Tea has helped the country through warfare in WWI, and it seem obvious here that it was contributing to the spirit and health of both the people and the military through WWII.
Would be nice if they had another actor for the role 😉
