An undergraduate Placement Year is an opportunity to work for an external company for a year. The role is similar to a graduate-level position and is great experience to prepare you for your future. Prospects has some helpful information on placements, and top places to find opportunities are Careers Connect, Ratemyplacement, Targetjobs, Studentjob.
If a work placement is an integrated part of your degree and you want to discuss this with an adviser, you can contact your College's Placements Officer (on the 'Meet your careers team' page for your College, scroll down to 'Contact careers team via email'). Otherwise, you can book a 'Work Experience and Internship Advice' appointment on Careers Connect to speak with an Internship Officer.