direct to your inboxThe region’s ten public health directors say the new strain of Covid-19 - said to be behind huge spikes in the south of England - is ‘extremely worrying’.Anyone who has travelled to Greater Manchester from ‘Tier 4’ areas - or Wales - for Christmas is being told to self isolate for at least ten days, warning the new strain of Covid-19 is ‘extremely worrying’.The conurbation’s ten public health directors issued the dramatic call in a statement this afternoon, urging anyone arriving to remain in whichever house they are staying at for that period, starting from Saturday, December 19.They are being warned not to have visitors over that time, including on Christmas Day, although people in the same house do not need to.