By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index struggled to stay at a 14-year high on Thursday, with Vodafone falling after a broker downgrade and Aviva down after a trading update.

The benchmark index in London fell 0.1% to 6,874.74, after closing at the highest level since December 1999 on Wednesday.

Dragging the index lower, shares of Vodafone Group PLC (VOD) gave up 1.1% after Goldman Sachs removed the telecom firm from its pan-Europe buy list and cut the rating to neutral from buy. The analysts explained that recent press reports suggest that possible suitors for Vodafone are looking at other takeover opportunities, which lowers the M&A potential. The Wall Street Journal reported earlier in the week that AT&T (T) is close to sealing a takeover of DirecTV(DTV).

Aviva PLC lost 2.9% after the insurer reported strong performance in Europe in the first quarter, but a disappointing U.K. outcome.

Also on the decline, Tullow Oil PLC gave up 2.8% after the oil-exploration company gave a disappointing update on its Kenya operations.

On a more upbeat note in London, shares of London Stock Exchange Group PLC advanced 2.2% after the company lifted its total dividend payment by 4.4%, and said that it has identified additional cost savings in relation to the integration of LCH.Clearnet.

Outside the main U.K. index, shares of Thomas Cook Group PLC slid 6.2% after the travel operator said a weakness in travel to Egypt reduced half-year revenue by 131 million pounds ($221.0 million).

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