We put DS's application in a month ago and travel in 5 weeks time. They've today asked for his dual nationality passport to check the names match. I'm not sure if this is usual but I am worried that if he submits it he won't have any passport to travel on if his British one is delayed. It's his first adult one, which may be relevant.
Does anyone have a good phone number to speak to a human at the passport office please as the email they've sent just has the address for the passport to be sent to?