The advert is a beer advert for maybe carlsberg or heineken, I'm not too sure TBH, and its quite old. Maybe the 90's or late 80's. Anyway, the advert is set in the 1940's or something like that, and...
I see that dfs are now claiming that d = discounts. f = four years' no credit. s = sale. Does this mean that when the winter sale DOES eventually end they will have to change their name to df?