Online Black Friday will be a stiff test for the virtual high street

… but a ‘seismic’ shift in Covid shopping habits will mean a cold Christmas for the actual high streetCoronavirus may be doing its best to cancel Christmas but, for the time being anyway, shoppers are carrying on regardless, with this week’s Black Friday online sales expected to reach new heights.In previous years, store chiefs have agonised about the impact on their high street chains of the US-inspired discount event, which arrived on British shores with a bang in 2013