DIY Light Emitting Diode (LED) Torch or Flashlight
I've got good news and bad news. The good news comes from James Dunn, who designed a build-it-yourself LED torchlight (called a flashlight in North America) to teach his Beaver Scouts the basics of electricity. It's a very useful project! The bad news is that it uses a no-slop medicine dispenser that might only be available in the United Kingdom and Australia. So here is the PDF of the plan James sent.
Nurofen Torch Instructions
If you think of ways to adapt it from other materials, please send feedback and I'll put it on this page.