I'm actually quite surprised at the number of schools who expect either a fourth A level or three plus EPQ.
We went to lots of open evening and all said that four A levels should be the exception and not the rule, and should only be considered if they would help a uni application. The thinking was very much that three excellent A levels would be far more beneficial than four good A levels as most universities base offers only on the top three. This was particularly stressed at the super selective. They only allow four A Levels if you get 64 points from top 8 GCSEs and if you can demonstrate why you want to do it. The vast majority of their students doing four are doing maths and further maths, rather than disparate subjects. The main exception to this is if someone is taking an A level in an MFL in which they are fluent.
DS is taking three essay based subjects for A Level, one which has an NEA (history), and was told that essay competitions, and showing additional work and research around his subject/s, would be viewed more favourably than additional qualifications.
At his first choice sixth form there is also compulsory participation as a volunteer in one of the school's "four pillars": Excellence, Integrity, Leadership and Community, which I think is wonderfully positive. DS is looking forward to this.
I also love the sound of @Pharos DS's schools "take an online course in something you have not done before". Perhaps everyone should do this at least once! 