Hi, not to disagree, but the English call any Lemon-lime soda "Lemonade".  For example, 7up or Sprite would be called a "lemonade".  So a Shandy is actually 3/4 draft beer and 1/4 7up.  It tastes like a Zima, does anyone remember those.  They were advertised as a malt beverage and basically it was sweetened and citrus flavored beer....a Shandy.  Shandy's are actually pretty good...if you hate the taste of beer, as I do, you'll find if it's mixed with the 7up it has a rather refreshing, pleasant taste. 
I was a bartender in a Radisson Hotel in Plymouth, MA for 17 years and had ALOT of tourists from England and made MANY a Shandy.  Debbie