Prime Minister David Cameron's official spokesman said Downing Street believed the impact of today's strikes to have been limited, thanks in part to "robust" contingency plans.
"My information is that the impact of the strike has been quite limited."
"The situation on the borders has been managed well and without delays and the vast majority of Job Centres have remained open, so the contingency plans have been working."
Contingency plans have involved drafting in additional people to man border posts, including some who have been trained up to work in the busy periods expected during the Olympics.
Have today's public sector strikes had the desired impact or did they simply fall short?
Unions have warned that strikes by public sector workers in the row over pensions will continue following a day of walkouts and protests.
UKBA workers strike against government cuts, but can Britain's borders be properly policed with a cut to their workforce?