BT and British Airways logos seen in this undated file photo

The UK faces double strike action as Unite the Union and CWU continue to persevere with their plans that could cripple both the nation's biggest telecoms provider and national airline if prolonged.

"There are no talks planned and the strike goes ahead tomorrow (Saturday)," a Unite spokeswoman said on Friday concerning their third of four walkouts by cabin crew of BA.

Meanwhile, Willie Walsh - appearing at the official launch of BA's first class cabin - remained bullish that British Airways would survive and that it would stay 'relevant' to its customers.

CWU, the Communication Workers Union, also said that it would begin asking its workers, including 50,000 British Telecom including engineers, call staff and administration workers whether they were in favour of industrial action after the company refused to improve a pay rise for five per cent.

Management had offered 2 per cent only.

"We're obviously very disappointed that BT has not improved its pay offer ... we now have no option than to put the wheels in motion to ballot all appropriate members in BT for strike action," said CWU deputy general secretary Andy Kerr.