Firstly congratulations to @MatureStudent21 and @quest1on on the offers and anyone else I may have missed in the rush to write this before my lovely Dh puts dinner on the table.
Madness re Welsh exams as my son's school in England do WJEC for English lang GCSE. Luckily he is sitting them 2022. The whole process of them being sat in classrooms is ridiculous unless they all sit them at the same time like an exam and have an invigilator in there rather than a teacher whose bonus may be based on grades.
Re Cags, Ds sits an end of topic test all the way through year 12, so did those until lockdown in March and then has resumed them in year 13. He will sit full mocks in December complete with study leave. So they are constantly testing and recording anyway and did before covid as a way to keep a student informed of their progression.
EPQs do offer a lot for unis, some reduce their offer by a grade with a high grade EPQ. I don't think they are box ticking, I think it teaches some real skills on research and presentation.
DS has also had an offer from Durham a couple of hours ago. It is a reduced offer and also a contextual offer. Usual entry requirements are A* AA, they have offered AAA or AAB for contextual. It is for computer science.