Splitting of Pension in payment

I have commenced proceedings after my pensions became payable earlier this year (state pension, two occupational pensions and an annuity for all those bits and pieces of AVCs etc I accumulated in a long and varied career).
My research so far shows up very little experience of how pensions might be split now they are being paid. X2B has small pension herself.
Any pointers on what I should watch out for v much appreciated.

from what I have been advised Xs F are allowed more of it as they tend to live longer than M