MSc Finance GMAT requirement

I study mathematics in Moscow, planning to take MSc Finance after my graduation.
My university GPA is 4.5 out of 5.0, which is a minimum equivalent to a UK 2.1. (I will have a low, but 2.1)

According to my research on the internet, the best places for MSc Finance are: LSE, Said, Cambridge, Warwick, Cass, Imperial.
However, Warwick and Cambridge require 1st Class Honours equivalent from Russia, which is impossible for me, meaning only four places left.
Most of the schools more or less say GMAT would be desired .

I took GMAT and got 710 (92 percentile) with section results quantative 50 (94 percentile) and verbal 35 (72 percentile), AWA 4.5 (42 percentile). Obviously, some problems with verbal section and essays.
Would you recommend me re-take the GMAT, or the result is enough for LSE and others taking into account my profile?

I think your GMAT is very good and won't hinder your chances for admission. Verbal could be a bit better but because it's Finance there is no problem I think. AWA over 4 is what every university wants. You should work on the other parts of your application process.

Said's average GMAT scores are >730.

Cambridge puts a a caveat saying ALL of its admitted students score a 1:1, but Warwick doesnt ( the last time I checked )

I think you should still try for LSE, Warwick, Cass and Imperial.

Dont worry about the GMAT