A Downing Street spokesman has told ITV News a "small logistical unit", including an unspecified number of troops, were paying £1 for showers while they were setting up the shower unit for troops staying at temporary living quarters at Tobacco Dock in east London.
However, the unit is now in place and the troops will be refunded, if they have not been so already.
More top news
British cyclist Simon Yates has failed drug test but his team are blaming an "administrative error" over an asthma inhaler.
Two ambulances crashed leaving one driver dead and three people seriously injured.
A scandal-hit NHS trust where a teenager drowned in the bath is still failing to protect patients from risk of harm, a watchdog has found.