What degrees/a levels do i need to be a science teacher? (uk!)?

Detailed answers please. i havent decided what on to take, i would like to take all three of biology, physics and chem at a level.
Answer
Im guessing you want to teach science at secondary school level, you only need to take one of the subjects at a-level and then continue it at degree level once you have a degree in one of the sciences you can do a teaching conversion course for a year.