Eurostar rail workers will strike for seven days over two weekends this month in a long-running dispute over work life balance. The walkout, starting this Friday from just after midnight until Monday, and then for three days the following weekend.
Transport Secretary Chris Grayling said he was "very disappointed the unions keep calling strike action over what appear to be pretty minor matters".
Eurostar said all passengers with reservations would be able to travel.
Eurostar runs services between London and mainland Europe and the walkout coincides with the Assumption Day bank holiday in France and Belgium on 15 August and the 29 August bank holiday in England, Wales and Northern Ireland.
The rail union says Eurostar has failed to honour an pre-existing agreement from 2008 which sought to ensure the train managers could expect a good work-life balance.
Source: BBC, Euronews