I'm interested in starting a PhD in computational mathematics at one of the top 5 universities in the UK.
My first degree is in Electrical Engineering. I went to one of the top 2 public sector universities in my country of birth. Owing to difficult personal circumstances and also the political turmoil in the country, I didn't perform well and graduated with a CGPA of 2.9/4. It's noteworthy the US style grading system was introduced for the first time in the country. The CGPA in question is still categorised as 'first division' by the higher education authority in that South Asian country. Later I completed a master's in Computer Science with an overall distinction. I have worked as a software engineer in the UK for well over a decade.
I don't think I have the mathematical background that would be expected of applicants for a rigorous computational maths PhD programme. Whilst I can master all the required maths on my own through self-study using resources like MIT OCW, I'm not entirely sure if I would be able to convince the admissions committee of my maths ability.
Would it make sense to complete a second master's degree in mathematics?
PS: I'm 40 and a UK citizen.