Yes, probably they have to do with a lot of applications. In my case I had frontloaded all the dcos except form 80. They asked form 80 and 1221 only for primary applicant (thats me). However, I submitted both the forms for primary applicant as well as for secondary applicant (my wife), as I read somewhere that these forms are basically required for applicants aged 16 or older. On 17 Sep i sent an email to the team. I got a reply on 2 Oct from a Visa Officer but not the team or case officer and he stated "The documents have been received and the correct team notified for processing, I don’t expect their processing to be complete for at least another 4 weeks". Huh...since then I am counting the days. 10 days have passed so far. Crossing finger.