It always used to be quoted by DV project that 2 women a week were killed by violent male partners. (sorry maths seems sort of offensive to the reality) So that would be 1 woman every 3.3 days
But recently if you look at statements or reports from Women's Aid, they are now saying at least 1 woman a week is killed. So would fit in with the maths you did.
Its all so horrible to talk in this way, but although it is only tiny, it means there has been the very tiniest improvement in terms of women being killed by men.
I am not sure, as this is relatively new as a concept but now agreed, that women who have committed suicide and are known to be victims of DV are to be included in annual figures.