Biomed student here. I agree with the other two replies. Biology covers human and plant and ecology etc (like at A-Level). The biochem and biomed first years at my uni have all the same modules (biochem, pharmacology, neuroscience, genetics, anatomy, cell bio, chemistry, physiology), but biochem in second and third year is a lot about chemical reactions, structures and metabolism. Biomed is generally a lot broader and has a lot more options in second and third year, specialising into the subject areas you study the basics of in first year. For instance, I'm going into neuroscience and pharmacology. Biomed is good if you don't currently know what you want to specialise into in terms of lab work, or if you want to do medicine later - around 50% of my year are planning on doing grad medicine.