– When will holidaymakers have to self-isolate?The measures will come into effect from midnight tonight, meaning that from Sunday all returning travellers will be have to isolate for 14 days.The quarantine applies to people returning to any of the four nations of the UK – England, Scotland, Wales and Northern Ireland.– Why is it being brought in now?The Government said the move follows a “significant change” over the last week in both the level and pace of change in confirmed cases of Covid-19