UPDATE 1-Jarvis swings to FY loss; COO to take over as CEO

* Says results in line with its view * Says prospects beyond '09/10 promising * FY pretax profit pre-ex 5.1 mln stg vs 7.5 mln yr ago

* FY exceptional costs at 11.4 mln stg

* Shares rise 12 pct (Adds details)

July 14 (Reuters) - British rail network services company Jarvis Plc (JRVS.L) swung to a full-year pretax loss mainly on one-off costs related to restructuring and redundancy, and said it expected tough trading conditions to continue through the current year.

However, the company said its full-year results were in line with its expectations and that its prospects beyond 2009-10 appeared much more promising.

The company also said its Chief Executive Richard Entwistle would retire in September and that Chief Operating Officer Stuart Laird would be elevated as its new CEO.

"The current economic conditions and Network Rail's decision to delay works created a difficult trading environment in the second half of the year under review..," Jarvis said in a statement.

For the year ended March 31, the company posted a pretax loss of 6.3 million pounds ($10.2 million), compared with a profit of 4.5 million pounds in the previous year.

Revenue rose to 345.8 million pounds from 321.9 million pounds, helped by the increased demand for rail services in the first half.

Exceptional items in the period were 11.4 million pounds, of which 8.1 million pounds related to restructuring and redundancy costs, it said.

Jarvis shares were up 12 percent at 7 pence at 0735 GMT on the London Stock Exchange. ($1=.6155 Pound) (Reporting by Tresa Sherin Morera in Bangalore; Editing by Gopakumar Warrier)