I've read that page on the MHA website and understand the registration requirement. What happens though if I have a valid Indian passport that I haven't surrendered after taking British citizenship? If I register for fast track using my Indian passport, and present my Indian passport at the port of ...

Thanks for your reply.

Actually, I've worked it out now. Rather unintuitively one needs to tick the "I do not agree" box in order to proceed without an Aadhaar number.

Just thought I'd post this reply in case anyone else gets stumped by the Aadhaar issue.

I've been resident in the UK for over 20 years and don't have an Aadhaar number. My Indian passport expired 18 months ago. I need to get it renewed (or "re-issued" to be more accurate). I'm based in London. But I'm stuck at the very first step - at the application form: https://portal3.passportindia ...