UK Immigration Law
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The priority for the court is the safe and secure housing of the child until the child is 18 and on that basis your wife will be expected to receive the bulk of the equity in the former matrimonial home in order to rehouse herself - with you waiting until your child is 18 or your ex cohabits before you receive your share
She has a claim on your pension - but this could be traded for her having a larger share of the equity so that the eventual split is say 60/40 in her favour rather than 50/50
There is no reason why you should not negotiate an agreement - possibly using family mediation which can then be reflected in a Separation Agreement prior to your leaving.
If you want it to have a chance of being binding then it would be best to have it drawn up by a solicitor. In general terms so long as there was full disclosure (both parties were honest about the assets) and both parties had legal advice then any agreement will stand.