The Consumer Prices Index including owner occupiers' housing costs (CPIH) 12-month inflation rate was 2.2% in September 2018, down from 2.4% in August 2018.
The largest downward contribution came from food and non-alcoholic beverages where prices fell between August and September 2018 but rose between the same two months a year ago.
Other large downward contributions came from transport, recreation and culture, and clothing.
Partially offsetting upward contributions came from increases to electricity and gas prices.
The Consumer Prices Index (CPI) 12-month rate was 2.4% in September 2018, down from 2.7% in August 2018.