After signing up to a new supplier through this service, you are allowed a ‘cooling off’ period of between 7 to 14 days. During this period, you can cancel the contract without penalty, provided the services you are purchasing are in excess of £35. After the ‘cooling off’ period has lapsed, you will have to give the supplier notice of your intention to end the contract. The notice that you need to give will depend upon the type of contract you took. Most contracts require 28 days notice prior to termination.