By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.K. stocks fell Thursday as a profit warning from British Gas's parent company weighed on its shares, while miners declined after a lackluster update on China's manufacturing sector.

The benchmark FTSE 100 index lost 0.4% to 6,689.45, with losses accelerating as the broader European market fell after the release of lower-than-expected economic data from Germany and France.

Centrica PLC shares fell 1.2% after the utilities company said it now expects full-year adjusted earnings of 19 pence to 20 pence a share, down from a previous expected range of 21 pence to 22 pence. Mild weather in the U.K. and trading conditions for British Gas Services are among the factors driving the profit forecast lower, the company said.

Pressure was on mining stocks as activity in China's manufacturing sector slowed in November, according to a closely watched report from HSBC, adding to worries about growth for a key buyer of metals. Rio Tinto PLC (RIO) shares fell 2%, BHP Billiton PLC (BHP) lost 1.8%, and Fresnillo PLC dropped 2.1%.

The HSBC China Manufacturing Purchasing Managers Index fell to 50.0 in November, compared with October's final reading of 50.4.

Outside of the FTSE 100, Mothercare PLC shares climbed 2.7%, with the baby products retailer swinging to a half-year profit.

You're invited: A free evening event focusing on investing opportunities in Europe

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."

Governments are in trouble, reform efforts have stalled, unemployment is climbing. the news from the eurozone is bleak. And investors are fleeing. But that's a mistake: The worse the economic data from Europe get, the more you should be buying. Why? Because actions by the ECB will boost asset prices and the stock market in particular. And, big exporters can grow sales. Lower costs and steady sales translate into higher profits and dividends. Join us for an evening of cocktails and conversation to explore these opportunities.

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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