By Devik Jain (Reuters) -UK shares fell on Friday as the growing prospect of aggressive monetary policy tightening coupled with a sharp drop in retail sales in the country prompted concerns about economic growth. The blue-chip FTSE 100 index closed 1.4% lower and the domestically focused mid-cap FTSE 250 index declined 1.3%. Retailers tumbled 2.5% as data showed British retail sales volumes fell more than expected in March from February, while consumer confidence approached all-time lows in April, hit by surging inflation. “It’s increasingly difficult to see consumer spending avoiding a downtu…