I want to apply for a UK passport for me and my kids but I can't figure out what I need to do without starting the application because it's not clear. I had a child passport which was used often as my parents took me abroad regularly when I was a kid, I don't know if I had an adult one as the last time I travelled abroad I was 17 but I vaguely remember it had expired under a 10 year rule previous to that and I think it had been renewed, but assuming that was a child passport I can't find any information on applying for an adult passport 20 years later, not having the original and having had a change of surname from marriage. My mum would know but she passed away and dad isn't much help. I think my mum sorted me having an adult passport that I just never used but I don't know if that's right and if it was it'd be long expired by now. I remember having one that expired but don't know if it was a child one. Either way, I can only find info on never having had one or upgrading current child passport, not on having had one I don't know the number of and not knowing if I had an adult one! Any advice appreciated!