The FTSE 100 Index closed down 0.34% to 5,760 points led by a poor start in the US and big losses at Cable & Wireless.
The FTSE 100 index closed up 1.12% at 5,787 points, its highest level since June 2001, led by M&A activity and an upbeat start on Wall Street.
The FTSE 100 Index has advanced 12.5 points, or 0.2%, to 5716.90 this morning, led by Northern Rock and British Airways.
The FTSE 100 Index closed down 27.10 points, or 0.48%, to 5633.80 today led by Yell, as Britain's Competition Commission said the firm was in a strong market position, arousing fears its growth may be curbed.
The FTSE 100 Index declined 41.20 points, or 0.72%, to 5699 today, led by Tesco as their in-line trading update failed to please investors more used to forecast-beating results from the grocer.
The FTSE 100 has gained 4.4 points to 5,736.2 this morning, building on Friday's close which was the index's highest level since June 2001.
The FTSE 100 Index rose 0.71% to 5,732 today, after crude oil advanced for the sixth time in seven sessions and the US signalled it may soon stop raising interest rates.
The FTSE 100 Index has slipped 0.1% to 5707.2 this morning led by drops in HBOS and Royal Bank of Scotland Group stocks.
The FTSE 100 is starting the new year well with a rise of 51.5 points, or 0.92%, to 5,670.3, as natural resources stocks such as BP have started strongly as the gas supply dispute between Russia and Ukraine drives fuel prices higher.
The FTSE 100 has topped 5,600 for the first time since August 2001. The index is currently up 3.9 points, or 0.07%, to 5,600.9, led higher by drugmaker AstraZeneca after it said it was buying a cancer specialist firm to boost its drug pipeline.