Britain's economy is feared to have plunged back into the red after figures suggested the powerhouse services sector shrank last month for the first time in two years. The Markit/CIPS purchasing managers' index (PMI) survey showed a reading of 48.9 in December, down from 50.2 in November and below the 50 mark separating growth from contraction. The result marked the first dip in the services sector since a snow-related decline in December 2010 and comes after disappointing...