By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Shares of Severn Trent PLC sank in London on Wednesday after a potential offer for the utility fell through, while banks turned lower on renewed concerns about Greece after unions called a general strike.

The FTSE 100 index ended 0.6% lower at 6,299.45, after swinging between gains and losses.

The index traded in positive territory earlier in the day, after data from the Office for National Statistics showed the U.K. unemployment rate stayed at 7.8% from February to April as expected, while total pay rose by 1.3% compared with the same period last year. Meanwhile, the number of employed people rose by 24,000 for the period, while the number of unemployed fell by 5,000.

"The quarterly labor market out-turns are typically volatile, and we are careful to not read too much into the single point out-turns. But today's headlines provide us with reassurance that the softer releases of the past couple of months are not turning into a deteriorating trend," said Victoria Clarke, economist at Investec Securities, in a note.

"That is clearly good news, particularly when set against the 'quality' of the jobs recovery, having been steadily building since last summer with job gains increasingly focused in full-time positions," she added.

The good news wasn't, however, enough to offset renewed worries over Greece. The two biggest labor unions in the country called for a 24-hour general strike starting on Thursday in protest over the government's shutdown of its state broadcaster, the Hellenic Broadcasting Corporation (ERT).

The banking sector was among major decliners, with shares of Barclays PLC (BCS) down 2.9%, Lloyds Banking Group PLC (LYG) off 1.3% and Royal Bank of Scotland Group PLC (RBS) 0.6% lower.

Among other notable movers in the index, shares of Severn Trent PLC sank 8.9% after the consortium seeking to buy the water utility on Tuesday decided to walk away from a potential deal, after three previous conditional offers were rejected.

Vodafone (VOD) fell 2.2% after confirming it made a preliminary approach about making an offer for Kabel Deutschland Holding AG , a German TV and Internet provider. There is no certainty that an offer will be made.

Shares of BT Group PLC rose 1.4% to 3.09 pounds ($4.84) after Credit Suisse reiterated its outperform rating on the firm and raised the price target to GBP3.50 from GBP3.

"We think BT can continue to cut costs for the next seven years (to 2020), but that the near-term potential for cost cutting is now more fully reflected in both company guidance and BT's share price for the first time since we upgraded BT to outperform [in September 2009]," the analysts said.

Outside the main index in London, shares of Daily Mail & General Trust PLC dropped 1.3% after Barclays cut the firm to underweight from equal weight.

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