I'm struggling to get work experience in a hospital or GP, what should I do?

Firstly, don't panic! I never had any NHS work experience when applying and I still made it. Lots of unis don't stipulate a required number of hours to have spent shaddowing a doctor, or any at all for that matter because they know how hard it is for us to organise. Working or volunteering in a nursing home for example is just as useful and really easy to arrange. You could talk about your experience with dementia, seeing all the different people involved in a patient's care, or perhaps how nurses respond if a resident has an unfortunate fall. Universities want to know what you have gained from an experience, not that you have witnessed some frontline medical procedure that you haven't really understood. The trick is to gain as much as possible from whatever experience you can get and most importantly always relate it to how it has prepared you to be a great medical student and future doctor.