Did your MP tell you if the security check is in progress? I ordered my GCMS notes too which says security has not started however, I called the local MP who advised that my file was sent to the third party for security check in first week of April.I did but no positive response, told my MP the file is in progress and don't need any additional documents for now.
Contacting CIC is a waste of time, they don't know more than us, Ordered notes which say Security hasn't started yet.