DWP sending out letters on my husbands and my private pension

Hi guys

I had a letter today from the DWP. I am in receipt of ESA, non working group, not UC.

The letter is asking for my partners and my pension income and also form about working. I explained I don’t work. So I am presuming it’s a standard letter sent to whoever.

I spoke with a helpful person who advised me that the DWP are sending these letters as standard for Data. She explained it doesn’t affect my claim and to complete the form.

I just don’t know why the DWP wants my husband’s pension information, as ESA contribution isn’t means tested.

Have you come across these types of letters before?

Thank you
Minxy