Please don't do anything
The British Humanist Association are getting all shirty about evolution not being in the primary schools curriculum. Primary schools are those for sprogs up to about age 11.
The BHA is dead wrong. There are plenty of far more important scientific concepts for primary schools - such as, for example, teaching the scientific method, what theories and hypotheses are, some experimental design, very basic statistics, precision vs accuracy .... And indeed more important non-scientific things they should be teaching, such as Latin, geometry and geography. Evolution is way down the list.
It isn't even "the most important idea underlying the life sciences today" like what they claim. That would be basic arithmetic, without which you can't do any science at all. You also need all the other scientific bits and bobs I mentioned above before you can sensibly talk about evolution.
I forget exactly when I first heard in school about evolution. Probably during GCSE biology when I was 15 or so. I don't think it was specifically taught either, I think it just arose out of a discussion about the mechanisms of meiosis and mitosis and how mutations can be introduced.