RPT-UK annual retail sales growth slows to weakest since 2013 in Q3

(Repeats with no changes to text) LONDON, Oct 19 (Reuters) - LONDON, Oct 19 (Reuters) - British retail sales suffered an unexpectedly sharp slowdown in September, dragging quarterly growth to its weakest annual rate since 2013, suggesting consumer demand remains uncertain as the Bank of England nears its first rate rise in a decade. Retail sales volumes fell 0.8 percent in September, the Office for National Statistics said on Thursday, reversing a jump in August and undershooting all ec