I had to ring the DWP yesterday as my Husband had not received an uprating letter for this year and we needed the breakdown of his entitlement. The lady I spoke to was very helpful and sorted out my request. She explained that to request the "breakdown letter",and when they do other admin work to a claim, they have to enter the claim under the "Change of Circumstance" option. If a letter is not needed they have to click on a box, and sometimes they forget. And this is why we get brown envelopes out-of-the-blue which frighten and worry us. I didn't know about this and thought I would share with you all.
The following user(s) said Thank You: Gordon, ivyfox