It may be useful to add that scope exists for year 11 pupils (i.e. in their final year of compulsory education) in England and Wales to have extended work experience rather than the usual 2 weeks. This enables pupils, usually with minimal academic inclination/ability to pass GCSE exams, to spend much longer, say 6 months, in work experience if their schools, parents/guardians and prospective work experience provider/s are agreeable.
Thus, for example, a pupil intent on becoming a vehicle mechanic could usefully gain work experience at a garage subject, of course, to appropriate measures such as effective instruction and supervision being provided.
In some cases the pupils who opt for extended work experience are ones who have been disruptive at school, e.g. because of a mismatch between their abilities/inclinations and the school education system/environment. Thus, if they effectively leave school earlier than their fellow pupils, they can benefit because they're getting practical experience and learning in a new environment of their choice. Furthermore, their teachers plus fellow pupils concentrating on studying for and taking GCSE exams benefit from the reduced disruption. Therefore, extended work experience, if properly organised, can be a win-win arrangement for everybody.
Though some of the above points might appear to malign pupils on extended work experience, they're surely a reflection of reality, based partly on what I used to hear from teachers and others involved in organising, vetting and monitoring placements. This includes cases where notably disruptive pupils with low motivation have been greatly changed by extended work experience, and moreover went on to gain good qualifications through vocational courses. Horses for courses as they say!
As several years have elapsed since I had any involvement with people dealing with placements, my above understanding about extended work experience might well be incorrect or out of date. Therefore, if anyone can confirm, refute or update the above summary, please do so.