FTSE 100 Index, the British benchmark stock market gauge, Thursday edged down 0.08 percent, or 5.32 points, to 6747.09 points.
TUI's share price decreased by 3.03 percent, topped the losers of the blue chips.
Prices of BP, Anglo American, Sky and Aberdeen Asset Management dropped by 3.00 percent, 2.84 percent, 2.74 percent and 2.68 percent respectively.
Inmarsat led the top gainers of the blue chips with a share price increase of 6.69 percent, followed by Old Mutual (4.85 percent), GlaxoSmithKline (2.68 percent), Taylor Wimpey (2.29 percent) and Legal & General Group (1.74 percent).
Trading volume in FTSE 100 companies was around five percent smaller than its 30-day average. And the index has gained 5.27 percent so far this year.