@DivorcingDebbie25 so I am assuming that when you mention your small pension - are you referring to a state pension or has he been putting money into a private pension for you?
I am no expert but I believe you do have a claim on his pension. A forty‑year marriage as a SAHM, supporting his career and raising his kids. This is textbook long‑marriage, needs‑based, equal‑sharing territory.
You do not have to accept “half the income.” I think your husband is describing a pension attachment order (also called earmarking). These are rarely used because it means you only get income when he chooses to retire, he controls the timing, you get nothing if he dies first, you cannot take a lump sum, you cannot plan your own finances and it keeps you tied to him and so Courts avoid these because they are controlling and unstable.
The normal route is a Pension Sharing Order (PSO). As part of the financial settlement for the divorce, a percentage split is decided (can be 50/50) of the actual pension fund as it stands upon your divorce.
But you do not get it as cash, it gets transferred into a pension scheme in your name so you have control of your share of his pension and he no longer has any entitlement to it or any say in what you do with it. A PSO means you control when you retire (as long as its within the terms of the pension). So I am assuming you are early 60's so lets say 62, so for example pick a pension scheme with an expected retirement date of 63 then at 63 you can take 25% tax‑free lump sum (if the receiving pension allows it) upon retirement which you can use for whatever purpose but presumably to top up funds available for a house. Then with the remaining 75% you then get your own income stream, separate from him as a pension, if he dies, your pension is unaffected so basically you are financially independent of him. This is the standard outcome in long marriages.
You can ask for half the value (but if you have a private pension he can ask for half of yours too). In a 40‑year marriage, the starting point is 50/50 of all marital assets, including pensions. Courts don’t say “half the income.” They say “half the value.”
Future inheritance - Once divorced, you have no automatic claim on his future inheritance unless you leave the financial order open (which you shouldn’t).
But you can argue that you sacrificed earning capacity as having been a SAHM for 40yrs diminishes your earning capacity now (if you are young enough to work) as you supported his career especially with child and home care, but that should not affect your long term financial security, This affects the settlement now, not future inheritance. But if he is coming up to retirement if they do afford you like a maintenance payment, it would only be until he retires not after.And if that is the case he may just retire now.
Asking for half the current value of his pension fund upon divorce is the norm, but it goes into a pension for you, it is not cash. Whilst he is asking for a rare, disadvantageous option that keeps you dependent on him and allows him to control you and will significantly reduce your options.
Speak to a solicitor for the financial settlement. Do not agree to anything until you have had advice,