BUS and coach operator Rotala saw further expansion in the first half despite difficult markets but has warned that in such a volatile climate growth predictions are difficult to determine.The Birmingham group, which operates the Flights Coaches business and last year acquired Preston Bus Ltd (PBL) in a deal worth £3.2m, said the squeeze on local authority contracts had had a bearing on business but generally it was pleased.Turnover during the period to May 31, 2012 rose 7% to £28.5m (2011: £26.6m), while pre-tax......for the full story register now for free or login below...