I found this:
I divorced some years ago and have not paid sufficient NI contributions nor have I remarried. Can I use the NI record of my former spouse.
Yes. If it will result in more basic State Pension you may substitute the NI record of your former spouse for either:-
# All tax years during your working life up to the end of the tax year in which the marriage ended or the end of the tax year before you reach State Pension Age (SPA), whichever comes first; or
# All the Tax Years in your working life from the beginning of the one in which you and your former spouse married up to the end of the one in which the divorce took place or before the one in which you attain SPA, whichever comes first.
Also:
I am divorced, but can I still claim some extra state pension on my ex-husband's NI contributions when I get to 60?
Yes. So long as you do not remarry and you will be getting less than the full amount of state pension, you can substitute the record of your former spouse for the period up to when your marriage ended, or the end of the tax year before you reached state pension age, whichever comes first.
From this site:
http://www.pensionsadvisoryservice.org.uk/stat e_pensions/divorce/
The Home Responsibilities Protection that buildersmate refers to cannot apply in your ex-wife's case because she had been paying reduced Married Womens' Contributions.
As far as I know, she cannot claim on your contributions unitl you are drawing state pension yourself. That is certainly the case for husbands and wives who remain married.
I would be surprised if any entitlement adversely affects your pension, but to put your mind at rest telephone the Pensions Advisory Service on 0845 601 2923, or the Department for Works