Not surpised about teaching on GCSE Computing
The reaching of Computer Science when down the pan when the teaching professional got its name changed to ICT. Instead of learning how computers work, they taught how to use a Spreadsheet, Word Processor and creating Powerpoint presentations. After so many years of ICT, how you can expect them to understand let alone teach computer science. The current GCSE Computer Science books which I purchased this year are little more than comics with pictures and a few sentences not the 300 page brick that I used.
Unfortunately it has extended into the degree area when talking to young colleagues they explained than when they studied different computer architectures it was Intel and AMD x64 designs. When a better choice would have been Intel or AMD compared to ARM or MIPS.
My son decided not to study Computer Science due to choice of syllabus (not all exam boards are the same) and teaching he had already received. While disappointed, I indicated that he could always study it later.