By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks moved lower for a second straight day on Wednesday, after stronger-than-expected unemployment data added more pressure on the Bank of England to hike its key lending rate.

The FTSE 100 index lost 0.5% to 6,838.59, setting it on track for the lowest level in almost a week.

The benchmark opened in negative territory, but nudged a leg lower mid-morning after labor-market data beat expectations and raised calls for the BOE lift interest rates. The U.K. joblessness level for the three months to April fell to 6.6% from 6.8% in the three months to March, beating forecasts of a 6.7% reading. Meanwhile, the number of people claiming jobless benefits fell by 27,400 in May compared with April, marking the 19th straight month the claimant count has fallen and coming in stronger than anticipated.

"The latest U.K. employment report was simply exceptional," said Nick Beecroft, senior markets analyst at Saxo Bank, in a note. "The pressure on the MPC is mounting."

The BOE's Monetary Policy Committee, the MPC, has sketched out a range of economic measures that need to improve before it considers raising interest rates from the current record low, with the labor market an important factor.

After scrapping its initial forward guidance, which focused only on the headline unemployment rate, the MPC has given more weight to other labor-market factors, such as wage growth.

And the latest U.K. salary numbers weren't great. In the three months to April, average earnings including bonuses rose 0.7%, down from growth of 1.9% in the three months to March. With inflation at 1.8% in April, that weak growth effectively means that real wages are shrinking.

The slow salary increase in April was mainly due to the impact of a top-bracket income tax change that boosted pay this time last year, Chris Williamson, chief economist at Markit, noted in emailed comments.

"Weak pay growth and the 'cost of living crisis' remains the Achilles heel of the economic recovery, but it should not be long until we see earnings growth accelerate as the labor market continues to tighten," he said.

The pound (GBPUSD) rose after the data, trading at $1.6795, up from $1.6753 late Tuesday.

In corporate moves, airlines were lower after a profit warning from Deutsche Lufthansa AG . Shares of International Consolidated Airlines Group SA -- the parent of British Airways -- lost 4.8% and EasyJet PLC gave up 3.3%.

Analysts also noted that the World Bank's forecast downgrade for global growth and Emirates canceling an order for 70 Airbus aircraft have raised concerns about future volumes of passenger traffic.

Engine-maker Rolls-Royce Holdings PLC said its order book will fall about 3.5% after the Emirates cancellation, which sent its shares 2.1% lower.

On a more upbeat note, shares of J Sainsbury PLC gained 2% after the supermarket chain said first-quarter sales fell 1.1%, which was in improvement on the 3.1% sales drop reported in the fourth quarter.

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