CS is known for having a pretty heavy gender bias - just 21.4% female this year. Have you seen this with your own cohorts? How about ethnicity of students – does computer science normally have a different uptake than the general population of the school? [1]
Why do you think that is? 
[1] edtechnology.co.uk/latest-news/gcse-results-increase-in-number-of-females-taking-computing/
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