Not how it works. Best you find this out now.

All the assets need to be split before the court will agree the legal separation or the divorce. This includes the pensions. Your pension valuation is considered a liquid asset to they don't physically touch your pension pot. The money is only considered for the M timeframe. Once that calculation is done then an amount goes to whomever is entitled.

Same with the house.
And the car.
And all the furniture.

Me:43 Her:42
M:14
S:9
EA started 2014/03 (or there abouts)
PA started 2014/05/30
BD:2014/11/05
I left 2015/10/01
I returned 2015/05/02
She left 2015/06/10
OM still on the go.