You really need legal advice...perhaps the Citizens Advice could be a good starting point.
If you are in a union you can sometimes access legal advice.
I am no lawyer but supported my daughter through a messy divorce involving 2 children and weeks in court!
You may find that you are entitled to half your joint assets, and half your joint income. Also your pensions will be equalised, meaning a transfer into your pension of funds from your wife's pension to make them equal.
In addition if you have the children more than your wife you will get maintenance in relation to the extra time you have them.
My daughter was told by the judge that the division of assets was final. But the spousal and children's maintenance could be adjusted by the court if her finances changed in the future.
I do hope you get a better forum reply from someone with more than limited personal experience to draw on but I didn't want you to have no reply and no hope!
Hope it helps a bit!