Unable to change name post marriage.

I tried to register to get a pension forecast. My details were not recognised by HMRC as presumably I have not informed them of my marriage 5 years ago, even though I have been in constant employment paying tax and NI. When I tried to change my name, using my Passport and driving license, one or both were rejected as they were already in my married name. I am at a loss how I can change my name or gain access to my pension records when my name has been different for 5 years. Surely this is not an unusual occurrence and HMRC can see the connection via my NI Number. Thanks

Hi
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