These regulations apply to the relationship between the person appointing an agent (called the "principal") and the agent appointed to sell the principal’s products (eg windows).
An agent acts on behalf of the principal. An agent can create a contract between the principal (ie. the seller) and the customer without actually being a party to it.
The Regulations – drafted in 1993 – don’t apply to agency appointments which are for the supply of services only, where the agent just introduces customers instead of completing sales or where the agent’s work is their secondary job or source of income.