I'm a current 3rd year cosmology and astrophysics student and studied maths and physics a-levels. I found doing the maths a-level helped me feel more confident in my physics work as there was quite a bit of repitition with the maths involved, however you definitely don't need to do maths to do physics. I had other classmates do separate, physics-focussed maths lessons as they needed extra help understanding mathmatical techniques used, however it is doable without this help if you're willing to learn it yourself.
Overall, it is possible to do without maths as another a-level, but there may be some places where you might struggle more compared to those that do maths as well.
Hope this helps!
Arya (Lancaster University Ambassador)