*UK JAN. CONSUMER PRICES FALL 0.5% M/M; EST. -0.5% *UK JAN. CONSUMER PRICES RISE 3% Y/Y; EST. +3.0% *UK JAN. CORE CPI FALLS 0.6% M/M; EST. -0.7% *UK JAN. CORE CPI RISES 3.1% Y/Y; EST. +3.0%