There's a great, simple, secondary resource for Black History Month (that's October, ie now!) on the TES website.
The Black Scientist Trail has posters featuring 11 black scientists, with basic information about them. The idea is that pupils read each poster then do internet research to find out the scientists' names. It's downloadable as a PDF and includes the posters, a pupil sheet and the answers. Schools could organise it as a competition, with a prize for sheets filled in with correct answers.
You can download the resource at: www.tes.co.uk/article.aspx?storycode=6003163. You will have to register on the TES website, but it's free.