Britain's top share index gained 0.8 percent by midday on Monday, as banks and commodities rallied following the previous session's falls and British Airways climbed on hopes of a global alliance.
By 6:54 a.m. EST, the FTSE 100 <.FTSE> was up 40.36 points at 5,182.81, having finished 0.4 percent lower on Friday, although trade was thin with Wall Street and most Asian markets shut for respective public holidays on Monday.
Anthony Grech, market analyst, at IG Index said with U.S. and Asian market's closed we may have already seen the biggest moves in the stock market today.
There is always the potential for the Greece situation to add in a little bit of short-term volatility but for now it would not be a surprise to see sideways trading for the rest of the session, he said.
Banks, which have been hit recently with uncertainty over the European Union's Greek rescue plan, were back on the front foot.
EU leaders promised to help Greece at a summit on Thursday, but did not give details on what they could do to support the Mediterranean state in tackling a deficit and debt crisis.
Appetite for perceived riskier assets returned as worries over China's monetary tightening policy faded, with miners Vedanta Resources
Energy stocks were also higher with BG Group
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Selected defensive issues were among the fallers. British American Tobacco
Europe's top home improvements retailer Kingfisher
No significant economic data was released on Monday, but investors kept a wary eye on Tuesday's UK inflation data and Wednesday's unemployment report.