In general, the laws that apply to buying things in shops also apply when you buy by mail order or over the internet.
The Distance Selling Directive gives you extra protection when buying from any European Union country:
However, it doesn't cover auctions (including internet auctions), or buying from countries outside the European Union, such as Switzerland or America.
These regulations mean you must be given certain information before you buy. This includes:
You must also be given:
The Regulations don't cover everything you might buy. Holidays and financial services (loans and investments, for example) are two such things. These are covered by their own separate rules.