It is feasible to produce a seasonally-adjusted series corresponding to Tables 56 (CPIH) and 57 (CPI) on a monthly basis. There are different options about how to do this that all fall within the various guidelines on seasonal adjustment from the United Nations, Eurostat and the ONS.
When seasonality is taken into account, although the amplitude of the seasonal pattern has varied over the decades, there are big drops regularly in January and July, with big peaks in December and June.
The current month-on-month inflation should be reported in the CPI Bulletin as a main point, as a reference for how the actual figure compares to the “normal” value for that month. This is in line with other National Statistical Institutes (NSIs).