This is from the royal society of chemistry. There is one that is quite good called the year in industry (YNI) and you can do this for a year before you go to university. It sounds like a long time but it will be VERY helpful to when you want to apply for chemistry and help you to decide what you should do after your degree 🙂
As another choice you can look into trying work experience in a University lab. Some universities may do this if you are in secondary school but you can always google and email them to find out what is going on. Birmingham University have a really good chemistry and chemical engineering department ( We are University of the year 2014 :D) so you can email in and see what is around.
Hope that helped 🙂 please feel free to ask more questions if you would like to find out more