Inflation as measured by Consumer Prices Index fell to -0.1% in September, partly due to falling fuel prices, official figures show.
Ireland is "on a new path" and the top priority is to keep recovery growing, the Irish finance minister has said.
House prices in England have risen considerably faster than values in the rest of the UK in the last year, official figures show.
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The return to mild deflation is the latest sign of a slowdown in the pace of recovery.