Apprentices are different and the type of contract or agreement required depends on what Apprenticeship is being undertaken. Special care needs to be taken and legal advice should always be sought.
Further, depending on the age of the apprentice, it may not be possible to ask them to sign a 48 hour opt-out letter. Young workers (those under the age of 18 years) cannot work more than 40 hours in any week, and cannot sign an opt-out agreement.