The main piece of legislation governing advertising, pricing and packaging in the UK is the Consumer Protection from Unfair Trading Regulations 2008 which includes certain general requirements and other obligations relevant to specific products such as food and drink.
Packaging
The packaging of a product must not be misleading and must be clear as to the nature, quantity and price of the product. All packaging should display the price and quantity of the product and where necessary should include any relevant safety information (although if extensive, this may be included in an accompanying leaflet or booklet). There is no requirement in the UK to include the origin of a product on the packaging but if this information appears, it must be accurate.