LONDON, 2015-1-7 — /EPR Retail News/ — Overall shop prices reported deflation for the twentieth consecutive month, decelerating to 1.7% in December, after reporting deflation of 1.9% in November. Food reported annual inflation of 0.1% in December after reporting deflation of 0.2% in November. On a 12 month average basis, the Shop Price Index reported deflation of…