If you look at the entry requirements for the top universities, the very top don't ask for four As but have interviews and tests to differentiate the top students. Below that none of them ask for four As and apart from Maths/FM none ask for four A-levels at all as far I know. AIBU to think that working so hard to get four A*s at A-level is actually a bad thing? It doesn't get you anything and is a huge amount of work at a sensitive time in your life.
(I think there might be one degree at Imperial that once asked someone for four A*s. That is really an exception though.)