By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.K. stocks rose Friday, with shares of Rolls-Royce Holdings PLC gaining after the company landed a multibillion-dollar order, and the move helping the FTSE 100 finish higher for the week.

The FTSE 100 rose 0.6% to 6,716.79. It was on track to gain 0.9% on a weekly basis, which would mark its fourth straight weekly win.

Gains picked up pace in the U.K. and broader European markets after European Central Bank President Mario Draghi on Friday signaled the central bank is set to expand its asset-purchase programs if inflation remains persistently low.

Shares of Rolls-Royce climbed 0.5% as the company said it won a $5 billion order from Delta Air Lines (DAL) to make engines and provide support for 50 new aircraft. Rolls-Royce's Trent XWB engines will power 25 Airbus A350s, and its Trent 7000 engines will power 25 Airbus A330neo aircraft.

Other advancers include Tullow Oil PLC , whose shares climbed 3.4%. The oil-exploration company's shares are up more than 6% for the week, reflecting speculation that OPEC at its meeting next week may agree to cut output in an effort to stem the recent slide in oil prices.

On the FTSE 250 index, shares of Serco Group PLC dropped 6.7% after the outsourcing firm's rating at Credit Suisse was cut to underperform from neutral. After Serco last week unveiled "significant onerous contract provisions and the risk of more to come, we see huge uncertainty around the operational cash flows of the business," wrote analyst Karl Green in a Friday note.

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Will you be in London on Dec. 3? Then you're invited to our MarketWatch Investing Insights event, "The worse Europe gets, the more you should invest."

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Our panel will be led by MarketWatch Columnist Matthew Lynn, a renowned financial journalist based in London and the author of "Bust: Greece, the euro and the Sovereign Debt Crisis." He'll be joined by Mark Hulbert, MarketWatch columnist and editor of the Hulbert Financial Digest.

This event is free, but RSVPs are required. It will be held Wednesday evening, Dec. 3, in London. For more information or to RSVP, send an email to marketwatchevent@wsj.com.

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