Britain may have missed its March 29 target date for leaving the European Union, but British passports issued since then have already done away with references to the bloc.
"I was just surprised: We're still members of the EU," Susan Hindle Barone told the Press Association news agency.
She had previously tweeted a photo comparing her old and new passports.
According to the British interior ministry, individual passports could still bear the words "European Union" on the front cover, as old stocks are being used up.
Once Britain has left the EU, the old passports will no longer be issued.
Both passports are valid, the ministry said in a statement, adding that citizens cannot choose whether they would like the words included or not.
By the end of the year, all passports will revert from the current burgundy to dark blue, the colour of British passports before they became aligned with other EU member states.
Britain was supposed to leave the EU on March 29, but requested a delay after parliament failed to approve a divorce deal the British government had negotiated with Brussels to minimise disruptions.
At present, Britain's exit date is April 12, although EU member states are mulling a new extension request by British Prime Minister Theresa May. She has asked for a delay until June 30, while European Council President Donald Tusk has proposed a one-year flexible extension.
