Members of the Public and Commercial Services Union will also work to rule and stage an overtime ban from July 27 until August 20,

Britain’s first Olympics since 1948 is also facing a stoppage by another group of workers, train drivers working from East Midlands Trains.

It is feared the walkout by members of the Public and Commercial Services Union could lead to delays for thousands of spectators arriving for the Games at air and sea ports across the country.

Border Force staff who are members of the rival Immigration Service Union will work normally.