I'm from HK.
It's quite difficult to get work experience unless you have some contacts. It's uncommon to shadow doctors in hospitals, its not like some parts in UK. (It's not too much of a language issue probably). Seriously. I shadowed two GPs - one was my mother, the other was my mom's good friend. I was offered by a cardiologist last summer (my mom's friend) in QEH to shadow him for 5 days, but at last he said no because he checked with the hospital and it's not okay. I'm not discouraging you, you should still try.
My classmate did more than I did in HK- she was able to do some biotechnology stuff like polymerase chain reaction and electrophoresis in some labs. Also she stayed in Queen ELizabeth hospital officially for a week doing various things, including listening to lectures and stuff. She is very lucky. She got all of them because of her contacts.
So, maybe to start off with, ask some GPs that your family is more familiar with and ask them whether u can shadow them for a few days? WHy dont you try finding something in UK?
Anyhow, you should still do plenty of community service both health care and non health care, if you have not already done so.