Benefits And Workplace Pension

hi, I am currently in the contribution based support group of E.S.A and receive DLA mobility component at the lower rate and care component at middle rate, in august 2014 when I turned 50 I started to receive my company pension, I informed the DWP and was told this would not affect my benefits, which it hasn't. last may I think it was they wrote to me to ask me what my new pension would be for the tax year, I didn't know so I gave them the pension providers details so they could contact them directly, this year they have not contacted me regarding my pension increase which is a whopping £31.44 a year, well less than £1 a week, again this will not affect my benefits, my question is should I contact the DWP to let them know or just presume they will get the information from my pension provider again? I also received a letter regarding my DLA in march stating how much my payments will be from 11/4/16 the payment has remained the same as last year, I presume this is the same for everyone, thanks in advance

so should I just wait for them to contact me or contact them? when I initially did it, they didn't seem concerned about me providing details and even told me not to bother as it wouldn't affect anything, but I insisted on the grounds that I didn't want to be accused further down the line of not reporting a change of circumstances

while I am here I may as well ask about my re-assessment forms I sent to ATOS in December 2013 I think it was, I have heard nothing since I sent the forms back, this seems an awfully long time, is this common? or is it something I should be concerned about? my benefits have been paid normally in the time that has passed