For many consumer to business transactions purchased online or at a distance, a 14 day cooling off period applies. For example, if you change an energy supplier, buy some insurance, you can usually change your mind within 14 days. Cancellation can be free or a the cost of services already used. With a business-to-business or B2B transaction, this does not apply, unless specified in the contract. Cancellation can be expensive, so beware.