There was a much publicised court case not that long ago where two husbands were accused of misleading the court and hiding assets to avoid them being taken into account in a divorce settlement. The judgement was expected to result in thousands of cases coming back to the courts where the ex-wife thought her husband misled the court and had money/assets hidden.
I remember reading at the time that this happens a lot where the husband is earning a lot more than their wives, particularly when any children are grown up.
So OP I think you're right to be suspicious. I also think if he was being straight with you, you would have ISAs in your own name and probably a private pension fund too, both of which are tax efficient options.
Often when someone comes on here and is thinking of leaving their husband, they're advised to start saving up money as a kind of 'getaway fund'. In your case you need legal advice before doing anything. The more information you can give your adviser the better, so if you can, start copying anything like bank statements or anything else that shows income. Do your children think you knew about the money they are keeping for their father? Tread carefully there. Good luck.
Exploratory Essay Help: Navigating the Uncharted Territory of Writing
Where did 'please' and 'thank you' go?
Does anybody work out with kettlebells ?