By Josie Cox and Tommy Stubbington 

Stronger-than-expected U.K. manufacturing data propelled sterling to a new 2014 high on Thursday and buoyed stocks, already supported by upbeat results from Lloyds Banking Group .

The Purchasing Managers' Index in April rose to 57.3 from 55.8 the previous month, boosted by an increase in domestic and overseas orders. It was expected to ease slightly to 55.

This latest sign of strength for the U.K. economy saw the pound extend gains, touching $1.6919--the highest level in more than 4 1/2 years.

"Recent survey data further reinforce our confidence that the recovery remains robust," said Lee Hardman, a currency analyst at Bank of Tokyo Mitsubishi UFJ.

"If that continues, the Bank of England will come under increasing pressure to consider tightening monetary policy," a positive for sterling, he added.

Elsewhere, trade was quiet, with much of Europe out for the May Day holiday.

The U.K's FTSE 100 broadly tracked gains in the U.S., where the Dow Jones Industrial Average closed the previous session at a 2014 high, after the Federal Reserve reduced its bond purchase program in line with expectations. The benchmark U.K. index was 0.4% higher in by midmorning.

Notable gainers included Lloyds, which reported a 22% rise in adjusted profit in the first quarter, as bad loans fell in an improving U.K. economy. British Sky Broadcasting Group climbed too, after it recorded a fall in profit but a rise in quarterly revenue.

BSkyB is 39%-owned by 21st Century Fox Inc., which until June last year was part of the same company as The Wall Street Journal's parent News Corp.

The euro continued to strengthen against the dollar, rising 0.2% to a three-week high of $1.3889. The common currency rallied on Wednesday after euro-zone inflation bounced back from its March low, dampening expectations of further stimulus from the European Central Bank.

The pickup in consumer price growth "puts the nail in the coffin of any potential ECB [quantitative easing] policy, at least in the short term," said Peter Kinsella, a foreign-exchange strategist at Commerzbank.

Overnight, Chinese data showed that manufacturing had picked up slightly in April, suggesting that the economy is recovering after a lackluster start to the year.

The official purchasing managers index ticked up a notch to 50.4, compared with 50.3 in March, where any number above 50 indicates expansion. The result was in line with the median forecast of 11 economists polled earlier by The Wall Street Journal.

In commodities markets, gold was 1% lower at $1,283.40 an ounce, and Brent crude was down 0.6% at $107.40 a barrel.

Elsewhere, the recent pickup in merger and acquisition activity continued to dominate headlines. Alstom's chairman on Wednesday night defied France's government by plunging ahead with plans to sell parts of its business to General Electric.

In the U.S., meanwhile, AT&T approached DirecTV about a possible acquisition of the satellite-TV firm, according to people familiar with the situation, the latest sign of a possible shake-up in the television industry.

Write to Josie Cox at josie.cox@wsj.com and Tommy Stubbington at tommy.stubbington@wsj.com

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