There is a common misconception that resources are all divided ‘50/50’. In fact, that is a relative rarity. In England and Wales we have a highly flexible system, designed to take account of the individual circumstances of individual families, avoiding the one-size-fits-all approach of some other jurisdictions.
So, this is an area where you would be wise to take some expert legal advice from a qualified lawyer (either apart or together) to understand what is fair in your particular situation.