Chickie contributes: Lemon fizzy as added to lager in the UK is called a "Shandie" or "Shandy"?

We drank these at a bar (the Student Prince?) in Virginia Beach during my sailor days. The standard was Guinness and Schweppes Bitter Lemon. We also did a Black and Tan Shandy which was Guinness, Bass Ale and Bitter Lemon. The bar standard was half and half Guinness and Bitter Lemon. We bought the ingredients separately and mixed our own, significantly lighter on the Bitter Lemon. The Black and Tans we mixed were also somewhat lighter on the Bass than on the Guinness.

Incidentally, the norm these days for half and half in American bars is to pour the Guinness carefully over the Bass so as not to mix the two ingredients. This gives you a drink with a golden bronze lower layer with a black black upper layer. Is this the standard for half and half in Britain?