By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.K. stocks turned higher Friday, with Royal Bank of Scotland Group PLC shares leaping after the bank's financial update, and as data showed U.K. economic growth expanded in the second quarter to above pre-crisis levels.

The FTSE 100 reversed course and rose 0.1% to 6,826.83. It was on track for a weekly rise of more than 1%.

Shares of Royal Bank of Scotland Group PLC extended their gain to 12% as the company said it expects pretax profit of GBP2.65 billion for the first half of the year, compared with GBP1.37 billion in the year-ago period. Second-quarter net profit fell on charges.

Overall, stocks were up after the U.K. Office for National Statistics estimated U.K. gross domestic product rose by 0.8% in the second quarter, from the first quarter. The first estimate from the ONS, which met economists' expectations, indicates output in the U.K. is back above the last peak, seen in the first quarter of 2008. Year-on-year, GDP rose 3.1%.

Vodafone Group PLC shares gained 2.6%, with the mobile-phone industry heavyweight saying there's signs of stabilization in some key European markets, even as quarterly revenue grew at a lower-than-expected pace

But BSkyB shares led decliners on the index, with a 3% pullback after the British broadcaster said it will pay 4.9 billion pounds ($8.3 billion) to buy Sky Italia and a 57.4% stake in Sky Deutschland from 21st Century Fox Inc.(NWS). The deal paves the way for BSkyB to create a pay-TV business across Europe.

Grabbing attention off the FTSE 100, shares of Balfour Beatty PLC jumped 10% as the construction and services company said it is in preliminary merger talks with rival Carillion PLC . Carillion shares also climbed 10%.

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