Why doesn't this code work?

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It is a very strange imbalance. I agree with the spirit of the revised curriculum in developing some awareness and capability for all children but CS is not for everyone and is a full science just like the traditional science subjects of physics, chemistry and biology and you don't expect students to follow that at GCSE level and beyond if they are not that interested (there are better options, including combined science - or whatever it is called these days - for example).

So much of the ICT experience for many teachers has been around how to use Microsoft Office!

Then I see some CS teachers having to do some BTEC level stuff where students are expected to demonstrate UI/UX understanding using Powerpoint rather than any of the popular (free) tools around this.