Anyone who starts a degree spending £37k in fees, and half a decade of their life might want to see the job they are going to be doing at the end of the course, whether it's required or not. So good idea as c.65% of pharmacy graduates end up in community pharmacy, hospitals/GPs around 25%.
Many people pick pharmacy in clearing knowing nothing about it because they have missed their grades for dentistry or medicine. A couple of years ago I had a Saturday boy in one shop I used to locum at, and he had done exactly that, and hated his degree, and his job! He missed by one grade, so should have re-sat and taken the course he wanted to do, but felt under pressure from friends and family to 'do something'. This is much more common that you would think, hence lots of pharmacists trying to get into GEM.