Have you got an up to date CETV for his pension? It could be worth a lot more than the house.
Have you got a final salary pension of your own?
Not sure whether you can be made to stick to the Separation Agreement if it''s considered unfair.
As well as CETV, you need to know how much his lump sum will be and what the annual pension will be. If he is close to retiring and getting a lump sum, that may well be treated as part of the cash pot. The remainder of the pension could be shared or retained entirely by him.A lot depends on what pension arrangements you have, whether he gets another job, how he is housed etc.
In my case ex was months from retiring. He got 20% of cash assets, plus his pension and lump sum. Worked out as 80:20 cash to me, 30:70 pension to him. It was enough to house him.