Europe performed worst of all the group’s regions with revenue per available room 70 per cent lower year on year in the final three months of 2020 — Photo by © Chris Ratcliffe/Bloomberg

InterContinental Hotels Group, owner of the Holiday Inn and Crowne Plaza brands, has warned that the difficulties of the "most challenging year" in its history have stretched into 2021 as new strains of coronavirus force countries to close borders and limit travel.

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