The FTSE 100 shook off hefty falls in Premier Inn owner Whitbread to end the week in positive territory, with gains elsewhere in Europe and the US too.

The FTSE 100 index closed up 26.58 points, 0.3%, at 9,720.51. The FTSE 250 gained 52.44 points, 0.2%, at 22,143.91, and the AIM All-Share ended 5.09 points higher, 0.7%, at 754.08.

For the week, the FTSE 100 was up 1.9%, the FTSE 250 climbed 3.8% and the AIM All-Share rose 2.6%.

The session got off to a chaotic start as trading on the Chicago Mercantile Exchange (CME), one of the world’s major trading operators, was halted by a technical outage.

“Due to a cooling issue at CyrusOne data centres, our markets are currently halted,” the CME said in a statement.

Joshua Mahony, at Scope Markets, said the malfunction impacted trade across

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