By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.K. stocks gained Friday, with shares of Petrofac Ltd. helping to guide the benchmark FTSE 100 higher after a turbulent week for equity markets worldwide.

   The FTSE 100   rose 0.6% to 6,229.74, but remained on track for a weekly loss of 1.7%. 

Shares of Petrofac Ltd. jumped 2.1% on Friday, gaining after the provider of services to the oil and gas industry said it's on track to meet its full-year profit expectations, in the range of $580 million to $600 million.

Meanwhile, Tullow Oil PLC tacked on 1.8% as the company plans to resume exploration activities at a number of its oil sites in Kenya after resolving a dispute with workers, according to a Dow Jones Newswires report.

But Rolls-Royce Holding PLC skidded 7.3% lower after the engine maker cut its full-year sales projection, saying it's received a number of canceled or delayed orders as economic conditions have worsened and Russian trade sanctions have tightened.

In other action, Jimmy Choo PLC shares made their trading debut in London. Stock in the high-end shoe maker were up 0.5% after they priced at 140 pence each ($2.27), at the bottom of an expected range.

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