Britons are gearing up for a wave of strikes by workers across different sectors, including postal services which could experience the longest strike in its 300-year history, affecting the busy Christmas season.
Downing Street branded the industrial action which includes postal workers, airline crews and railway operators as "completely unacceptable".
More than 3,000 Post Office workers are taking industrial action in a dispute over proposed branch closures and pay.
On Southern Rail, as part of an ongoing dispute, staff are protesting the change in role of guards, bringing disruption to around 300,000 passengers.
With the Christmas holiday period marked by massive travel upsurge, British Airways and Virgin Atlantic airlines also face the prospect of industrial action over Christmas if conciliatory talks being held today fail.
"There will be little or no impact on Royal Mail as a result of the CWU strike at the Post Office.
Deliveries will carry on as normal and the last posting dates for Christmas remain unchanged," a Royal Mail spokesperson claimed.
British Airways also says it has "detailed contingency plans" that will allow it to run a full schedule even if the cabin crew strike does go ahead.
RMT workers' union general secretary Mick Cash said: "Our conductor members on Southern are on strike this week in defence of the safety of the travelling public.
In addition, Unite members employed by Swissport as baggage handlers and other ground staff at 18 airports across the UK are set to walk out on Friday and Saturday over pay unless conciliatory talks to be held on Tuesday yield positive results.
Frances O'Grady, general secretary of the UK's Trade Union Congress (TUC) trade union body, pointed out that all the strikes were for different reasons and that the focus should be on the root causes.
She said: "We are working in a background where workers are still 20 pounds a week worse off on average than before the financial crash, where we're seeing inflation rise and real pay cuts come in.
"Striking is always a last resort. We negotiate and settle thousands of deals."
Pressure is building on British Prime Minister Theresa May to take firm action in the lead up to a Cabinet meeting on Tuesday to discuss how to ease the crisis.
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