London Market Report
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(Close): London's benchmark FTSE 100 index gained 47.5 points, or 0.7%, to finish the day at 6822.76.
Shares rose on hopes that the European Central Bank will take more action to try to boost the eurozone, as the London market caught up with gains seen in Europe on Monday.
On Friday, ECB president Mario Draghi had suggested the bank could carry out more stimulus measures.
International Consolidated Airlines Group was the biggest riser, up 3.5%.
Shares in Antofagasta fell 1.17% after it reported half-year results.
The Chilean copper miner reported an 11.5% drop in core profits for the period. Profits were hit by rising production costs and lower copper prices.
Another faller was domestic and healthcare products company Reckitt Benckiser, which fell 1%.
On currency markets, sterling was little changed at just under $1.66 and a little under 1.26 euros. But the strong pound had "ravaged" advertising group WPP's earnings, chief executive Martin Sorrell said.
The company reported a 1.5% rise in headline pre-tax profit to £532m ($882m), but when currency movements were stripped out the rise was 15.6%.
Despite this, WPP still rose 1.39% on the day.