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London's benchmark FTSE 100 index rose 0.4 percent to 6,152.09 points compared with Friday's close.
In the eurozone, Frankfurt's DAX 30 index won 0.6 percent to 9,929.19 points and the Paris CAC 40 gained 0.5 percent in value to 4,322.69.
Greek lawmakers adopted overnight a controversial package of pension cuts and tax hikes.
It comes as eurozone finance ministers geared up for an emergency meeting Monday to hammer out fresh reforms for Athens to stave off another eurozone crisis.