There are three essential protections included in the double jeopardy principle, which are:
- being tried for the same crime after an acquittal
- retrial after a conviction, unless the conviction has been reversed, vacated or otherwise nullified
- being punished multiple times for the same offense
London and Wales repealed prohibition against double jeopardy in 2003, so if you live there, you can indeed be tried for the same crime twice.