The average pension pot of a man in the UK is £73,600. The average pension pot of a woman in the UK is £24,900.
That is precisely because women are not paying into their pensions for years while their men continue to get pay rises. While they raise the children for their husbands, who wish to be fathers and who get to be fathers because of the sacrifices of their wives.
And if all had worked out, you would pay off your mortgage together and retire together and live off (primarily) his pension and investments together.
But that won't happen. It didn't work out.
So you need to ensure you don't screw over your children by trying to be 'nice'. The starting point is that you each own half of everything. So he will need to produce details of his pension pot. And if he earns £160k and has £50k cash assets, then I bet you he has investments too that you don't know about and that he may hide throughout the divorce.
So at a minimum get half of what you know about. He will undoubtedly keep 100% of the money you don't know about.
And with that money, you give your kids a good life, in a nice home, with days out and holidays and as little change as possible from the life they have now.
As others have said, he could wake up and meet someone else and not act like a good father - you can't guarantee that he will behave well no matter how well you think you know him. If he does, great. If he doesn't, make sure you have enough to take care of your kids without you working 3 jobs......