I am a member of the GOV.UK User Support team, responsible for improving the [government-only] support form (found at https://www.gov.uk/support/internal).
Back in April, we described the process for removing content from the frontend. To make this process easier, we have now added an 'Unpublish content' section. From now on, please submit all unpublish requests through the new section (and not through the 'general' section). The new section captures all the necessary information that GDS needs to unpublish (and thus avoids unnecessary delay in clarifying the details), and routes the request directly to the right team (again avoiding unnecessary delays).