I agree with this. You really need to renegotiate your marriage contract.
Also, rather than a pension top up, you could consider that yourself & your husband save towards acquiring a buy to let property instead that you then would manage & benefit from directly.
If ye saved enough for a deposit say, then assuming you have some spare time, (as you say you cannot get more hours) & think you could manage a rental property in your spare time, (it's not that hard tbh, provided that you're OK with admin, managing money (rents, paying mortgages & bills) & managing handymen & chores,).
You could then rent this property out & pay down the mortgage using rents alone hopefully, (don't forget to factor in taxes) which would be then just about be fully paid off at your retirement age...
(Then the rents are all yours when you most need them).
I like this option for you because
- It utilises some of your spare time
- You get a side hustle
- Prudent mortgages & debts tend to mostly go down, while asset prices & rents go up & mostly well ahead of cpi too generally
- You might even roll your equity over in this first property into acquiring a second rental property 5-8 years hence, provided it's performing well & it's capital price has gone up significantly.
- You then will have 2 houses potentially to leave to your disabled/ special needs kids in time, which also offers peace of mind to you, your DH & your kids (&/or whoever may need to care for them)
If ye can generate the savings to do this I would jump at this option tbh.
P.s. I don't have a clue about the residential market in the UK, but tbh don't get too concerned about that ime. Instead try to acquire as good a property, in as good a rental area as possible for you, that may benefit from long term uplifts such as a university / hospital / commercial activity expansions, new transport links or whatever in time (I.e. over the next 10-15 yrs say).
Good luck OP!!