Maths and Natural Science : Urgent

So I want to study natural science at a Russell Group University. I have wanted to study natural science ever since I was in year 9 but after having a really tough year and due to extenuating circumstances I am now currently on a gap year studying to resit some of my A levels. I received B, D, D in English, Chemistry and Biology respectively, however I still feel somewhat satisfied as I had faced a lot of hostility, discouragement and ignorance from my teachers and believe I can improve significantly as I have performed strongly in in GCSEs with 10 A/A*s out of my 14 GCSEs.

For natural science I am aware that they want you to have done 3 Sciences . However, I dropped maths at As with 163 ums.
If I want to get an A in maths I would need 480 ums , would it be more reasonable to retake English rather than Maths, to atleast meet 3As requirement, even though I would have to resit all three A2 exams for English as it's linear.

I am quite confident that I will be able to get A or A* in the sciences but I am unsure as to how I could achieve an A in Maths, due to the low UMS from As. Although Maths is something I really wish to study and I will probably will not get an offer unless I get an A ,it would be quite difficult to get an A still as I would have to do 6 exams for the two Sciences and more from Maths. So, please could you advice me on what the best options I have or the route I could take in order to study Natural Science?