In the North East of England, a request for a half and half would more commonly produce a combination of Scotch ale and India Pale Ale (IPA). This drink fell from favor when the Scottish & Newcastle brewery were obliged to sell many of their tied public houses and McEwan's Scotch and IPA disappeared from public bars across the North East.
In the United States and Canada, a capitalized Half & Half is Guinness draught and Harp lager. A lower case half & half is generic for Guinness draught and any lager/ale that will support the Guinness draught. When Bass ale is used, you have a "black and tan".
In the North West of England, principally Liverpool, and throughout Wales, the phrase half and half is used when you can't decide to have chips or rice with a take out meal. It can generally be ordered with any meal from a (usually) Chinese take away shop e.g. beancurd in blackbean sauce with greenpeppers, chips and rice. It is also popular with vivid yellow plain curry sauce draped over chips and boiled rice.
The term 'Half and half' (pronounced ARF N' ARF) is used on construction sites in London (eg. London King's Cross Station Redevelopment). Canteens, often staffed with cockney middle aged woman, use the term frequently between themselves to describe an order selection to be served to a worker. Most often there will always be a choice of meal where you can select the 'half and half' combination and one need only say when ordering the term 'half and half' to convey a well understood order.
Half and half commonly understood to be a bed of half chips and half rice. A classic selection would be 'chicken curry half and half' or 'chili concarne half and half'. However, slight various do apply. For example, 'spaghetti half and half' would be spaghetti bolognese served on a bed of chips. Rice in that dish would be plain silly.
Generally, 'half and half' is very satisfying given its high carbohydrate content. When consumed in a canteen environment, it is unlikely that one would suffer from food envy.
"Half rice half chips" is sometimes used as a slang phrase to describe a person of the bisexual persuasion.
Half and Half is an Owensboro, Kentucky-based tobacco company.