Hello and thanks for your question.
I need a bit more information to be able to answer:
Was the agreement between you & your husband turned into a consent order and approved by the court?
If not, was the agreement verbal or in writing, and did you get independent legal advice before you agreed?
How much was the lump sum that your husband paid you?
Was the house then transferred into his sole name?
How much was the house worth at the time he paid you the lump sum?
How much is it worth now?
If there's any mortgage on the house, what's the total mortgage?
What's your annual income?
What's the annual income of your ex-husband?
How old are you both?
How much would you guess his pension pot is worth?
If he's already receiveinbg his pension, how much does he get?
I'm assuming there are no dependent children?