@W0tnow, no EPQ, his 6th form thought 4 A levels would be enough work and a full timetable. It's a state school 6th form. He also got a place at a nearby 6th form college which he didn't take up, who had a different view, the EPQ was compulsory there, even with 4 A levels.
DS2 has a place at the new Cambridge Maths 6th form opening in September. He is going to do Maths, Further Maths, Physics and Computer Science A levels. They do not even offer the EPQ and I think they are hoping it will be a stepping stone to top universities. It was highly competitive with an entrance exam and interview and they only take people who are doing both Maths and Further Maths A levels.
DS1 wrote a bit of extra curricular stuff in personal statement, karate, badminton interest in photography and talked about his work experience. But it was mostly about his interest in Maths.
At his Cambridge interview DS1 was only asked Maths questions, nothing about extra curricular stuff of other interests at all. Cambridge obviously weren't bothered about him not doing an EPQ either, although he didn't get an offer in the end.
In fact DS2's interview for the Cambridge Maths 6th form was more thorough.
And Warwick say they do not even read the personal statement very thoroughly for Maths and make offers based on predicted grades and TMUA/STEP.