My daughter went down this route (she does particle physics and cosmology degree but on her uni application also had physics with astro as well as she liked it too)
She did the triple science route on GCSE. She had to choose history or geography as one of her GCSE's but it did not make a difference to her A'levels or degree.
Alevels she did Maths, further maths, physics and chemistry.
When she started her degree there was others students that did not do the further maths a'level and that was ok, as a lot of the further maths elements are learned in first year degree anyway. Personally for her it was nice to have that 'head start' by doing FM at a'level. One thing she wished she could have done was computer science (she did not do this at GCSE or Alevel). The people who did this have a head start on coding part of her degree in second year. She is doing an extra course on it as one of her module choices.
You don't have to do 4 A'levels either, its hard work and really full on, so a lot of people do three.