A restaurant and bar at County Hall on the South Bank has installed a division bell which gives MPs an eight-minute warning to make their way across the river to vote in the lobbies of the Palace of Westminster.
After a quiet summer during the Parliamentary recess, the bell is now sounding regularly in the bar when divisions are called in the Commons.
Some customers have mistaken it for a fire alarm but the bar says that the bell has proved a good talking point with guests.
To mark the installation of the division bell, Gillray's Bar has added 'Ayes' and 'Noes' cocktails to its menu.
Ayes is a sweet and fruity cocktail using egg whites, fresh lemon juice and raspberry syrup to complement London dry gin Tanqueray.
Noes is a bitter cocktail which features orange bitters, Benedictine and Dry Vermouth with Old Tom Hayman's Gin.
Gillray's Steakhouse & Bar – named after political cartoonist James Gillray – opened two years ago at County Hall.