Work experience, eh? Not just that week of helping out you do at your local leisure centre in year 10. Oh no, work experience can be undertaken at any stage in your educational life, usually in the university holidays and usually lasts for a week or so.
Be aware that work experience is slightly different to undertaking an internship. An internship usually lasts for a month or two and will be a structured programme whereas work experience can consist of assisting or shadowing another member of staff and completing ad hoc administrative tasks.