Like everyone else who's responding to you, I think you are mixing up monthly reporting of inflation since the same month the previous year (which is a sensible like-for-like comparison) with inflation since the previous month, which is almost always a silly and misleading figure because prices have seasonal change through the year.

Media tend to report this as stuff like "inflation dropped in January" but they don't mean since December, there are always January sales, that isn't useful information.