I applied to renew my British passport in February at the Peterborough office. I sent my expired British and my current foreign passport as supporting docs as I have dual nationality. My new British passport arrived soon after, but in mid April my expired British passport arrived back along with someone else's foreign passport for another country. I rang customer services who said to send back the other person's passport to Peterborough with a letter explaining the mixup. I did this the next day by registered post to ensure the safety of the other person's passport. I have had an email acknowledging that this was a security breach and have also had several calls to and from customer services, they say they are looking into where my foreign passport is but can't confirm if it is lost or not. Nobody can tell me if I will be compensated if they have lost it and I then have to apply for a new foreign passport. I am required as a national of my other country to use their passport when travelling to that country. As a result I am now unable to go there to visit my family after already not travelling there for 3 years due to Covid. Has anyone had any luck sorting out a problem like this? Does anybody have a direct number for the Peterborough passport office? Customer service says you can't call them as they have no number. I am getting nowhere. Help!