By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Barclays led the U.K.'s FTSE 100 lower on Tuesday after a weak earnings report, although most U.K. stocks advanced after better-than-expected data for the services sector.

Resuming trading after Monday's U.K. bank holiday, the benchmark index dropped 0.4% to close at 6,798.56.

Shares of Barclays PLC (BCS) posted the biggest loss in London, down 5.2%, after the bank posted a 5% fall in adjusted first-quarter profit.

Aberdeen Asset Management PLC fell 2.4%, after the investment manager reported a drop in first-half earnings.

Heavyweight mining firms were also among decliners, with shares of Anglo American PLC down 1.4%, BHP Billiton PLC (BHP) off 1%, and Rio Tinto PLC (RIO) 1% lower.

Most U.K. stocks, however, traded in positive territory, with investors finding support in strong data for the services sector. The Markit/CIPS services purchasing managers index for April rose to 58.7, up from 57.6 in March and beating analyst expectations. Growth has now been recorded for 16 straight months in the U.K. services industry, and Rob Wood, chief U.K. economist at Berenberg, said the U.K. economy is on track for another very strong quarter.

"Record low interest rates are no longer necessary. The economy is growing rapidly and, if anything, is picking up pace," Wood said in a note.

However, the Bank of England is unlikely to raise interest rates when it meets on Thursday, as it has already signaled that no changes will be made until the slack in the economy has been absorbed. Wood said he expects the first 25 basis-point rate hike to come in the first quarter of 2015, although he said there is a 35% chance it could already happen in the fourth quarter of 2014.

The pound (GBPUSD) strengthened after the data on Tuesday, reaching the highest level against the dollar since at least 2009. The pound was last trading at $1.6977, up from $1.6870 in late North American trading on Monday.

Outside the main index in London, shares of Balfour Beatty PLC slid 20% after the construction company issued its third profit warning in 18 months. Chief executive Andrew McNaughton stepped down Tuesday with immediate effect.

Dixons Retail PLC rose 3.6% and Carphone Warehouse Group PLC advanced 3.4% after Sky News reported that the two companies are poised to merge in a 3.7 billion pound ($6.3 billion) deal. Representatives from the two companies weren't immediately available to comment.

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