Chinese boost helps Britain's FTSE hit 3-week high

* FTSE 100 up 0.6 percent

* Growth sensitive stocks broadly gain

* EM exposure hits Unilever (NYSE: UL - news) , CCH

By Alistair Smout and Francesco Canepa

LONDON, Jan 20 (Reuters) - Britain's top share index rose for its fourth straight session on Tuesday to hit its highest level so far this year, buoyed by growth-sensitive stocks after Chinese data beat expectations.

Investors were relieved after data showed China's economy grew 7.4 percent in 2014, barely missing the country's official 7.5 percent target. Although it was China's slowest pace of growth in 24 years, many traders had feared a sharper slowdown.

Sectors such as financials and consumer discretionary, which are sensitive to optimism about the economy, rallied, adding more than 10 points to the blue-chip FTSE 100.

"There's a pretty broad rally on the back of the news from China, which is supportive of equities," said James Butterfill, global equity strategist at Coutts.

"The majority of miners are doing well, but Rio (Tinto) have missed estimates which is hindering the sector."

The prospect of stronger demand from top metals consumer China boosted miners such as Glencore (Xetra: A1JAGV - news) , Anglo American (LSE: AAL.L - news) and Vedanta, which rose between 3 percent and 7.8 percent.

Global miner Rio Tinto (Xetra: 855018 - news) lagged peers, rising just 0.4 percent after a production update. While iron ore production met targets, copper came in slightly below expectations, traders said.

"The numbers were only a slight miss versus estimates and the relative underperformance versus the market and sector we think is overdone," said Atif Latif, director of trading at Guardian Stockbrokers.

The FTSE 100 was up 40.33 points, or 0.6 percent, at 6,625.86 points by 1114 GMT, rallying for a fourth straight session and touching its highest since late December.

The index remains around 4 percent off a 14-1/2 year high hit in September 2014, hindered by a decline in heavyweight energy stocks as the price of oil has slumped and by concerns over global growth.

Consumer goods giant Unilever dropped 1.2 percent after reporting lower than expected underlying sales growth, hindered by weak emerging markets.

Coca Cola Hellenic also suffered from its global exposure, dropping 3.7 percent after a downgrade to "neutral" from "overweight" by JP Morgan analysts, who cited deteriorating macroeconomic trends in Russia and Nigeria. (Editing by Catherine Evans)