London's benchmark FTSE 100 index climbed 0.6 percent to 7,079.76 points, compared with the close on Tuesday.

In the eurozone, Frankfurt's DAX 30 gained 0.5 percent to 11,542.09 points and the Paris CAC 40 won 0.5 percent to 5,100.08.

In the US, President Donald Trump's Republican party maintained its control of the Senate but the Democrats regained power in the House of Representatives, in line with forecasts.

While the vote saw Trump's party lose overall power on Capitol Hill, analysts pointed out that the result is unlikely to lead to a reversal of the White House's popular tax cuts and deregulation that have helped to lift US stock markets this year.