Public Health Agency publishes weekly Notifications of Infectious Diseases (NOIDS) reports.
As useful as this is for monitoring, because the report is published every week in turn with data for the:
"current weekly total of notifications of infectious diseases in the past four weeks along with the cumulative total for the current year compared with corresponding periods"
...data beyond the past four weeks is lost every time the report is republished.
Public Health England publishes and archives each weekly report on their website, and has a single spreadsheet with the last 52 weekly cases of each notifiable disease. Additionally, their annual reports include a breakdown of patients' age, gender and PHE region.
PHA is collecting and publishing the same data, but because of the way in which it is published, each weekly report is effectively overwritten and perspective is lost, giving only a limited view on how infectious diseases are spreading.