I think he may be in for a shock. After a long marriage the starting point is 50/50 of ALL assets, which means the pensions and all other assets go into the pot to be shared when other debts have been cleared. Financial settlement on divorce is about needs and the means you have between you to meet them. He might prefer to keep his pension and allow you to keep your home but take advice about the relative values of both.
The financial settlement is separate from the divorce process. You can agree a settlement between you and go for a consent order drawn up by your solicitor to ensure it is watertight. This may be done after voluntary disclosure of your assets and possibly mediation.
If you cannot agree, the other option is the court route. Should you need to consider the court route, you will need to demonstrate that mediation has failed or is not possible. A declaration to this effect (MIAM) is an essential part of the divorce application.
Once you are in the court process you will each be answerable to the court for the timely production of documents etc. You will need to complete and exchange a full form E financial disclosure with supporting documents - bank statements etc. After that you each raise a questionnaire based on what is (and is not) disclosed. At the first hearing, the judge will decide which questions are to be answered and set a time frame. This is designed to make sure there is full disclosure before you reach the FDR ( final dispute resolution meeting) where you will be expected to negotiate and will also receive guidance from the judge on a fair settlement. If you don't settle at that point, you go on to a full final hearing where evidence will be examined by the court.
How things work out depends on a range of factors including length of marriage, ages, incomes, etc. Everything in sole or joint names goes into the pot initially.
Hope this is helpful. Been there and know how scary this all is. Stay strong! We're here to support you.