It contains milk. 
Do not say you were not warned.
Do they still put "a glass and a half into every bar"?
Of course in those days it was an honest 4 ounce bar for sixpence.
They still have the logo on the wrapper but I haven't heard the claim mentioned recently.
It is probably a much smaller glass these days even if they do.
This is the news story link
Cadbury_Dairy_Milk_Chocolate_Bars_Contain_Milk_Company_Warns_Consumers
I thought the warning was going to be 'May cause weight gain!'
@ contains milk and @ May cause weight gain!
What makes you say that merry? 
Grrrrr 
I'm saying nothing, but this is me on Boxing day