By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K.'s FTSE 100 index struggled for direction at the close on Thursday as shares of SABMiller rose after a well-received earnings report, while Royal Dutch Shell B shares slumped after a change in buyback programs.

The benchmark index closed slightly lower at 6,820.56, after swinging between small gains and losses earlier in the day.

SABMiller PLC (SBMRY) picked up 3.5% after the brewer reported a slight increase in full-year profit. The company said its strength in developing markets such as Africa and Latin America had held up in the past 12 months, but that it sees ongoing weakness in Europe and North America.

Mining firms were also on the rise after a much-stronger-than-expected manufacturing report from China. HSBC said the preliminary or "flash" version of its monthly purchasing managers index headline number rose a five-month high of 49.7 in May from a final reading of 48.1 in April. Upbeat Chinese data tend to support miners, as the country is a major user of natural resources.

Shares of Antofagasta PLC picked up 2%, Rio Tinto PLC (RIO) rose 1.3% and Glencore PLC (GLCNF) added 0.7%.

Royal Dutch Shell PLC (RDSB) (RDSA) shares were also in focus after the company said it has canceled its "Scrip Dividend Program", meaning all future dividends will be settled entirely in cash, rather than a share-based alternative.

"This decision will allow for a more efficient share-buyback program," the company said in the release.

Peter Hutton, analyst at RBC Capital Markets, said in a note that it would be particularly positive for the A shares, because Shell now can start to buy back those shares. Shell has historically only bought back B shares. Shell A shares rose 0.7% in London on Thursday, while the B shares fell 3.7%.

On a more downbeat note in London, shares of Royal Mail PLC slumped 9.7% after the company said it faces a couple of headwinds, including intense competition on the parcels side.

In data news, the Office for National Statistics said the U.K. economy expanded by 0.8% in the first quarter, confirming a previous estimate.

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