I am a dual national with UK and US citizenship living in the UK. My US passport needed renewing and I sent it off. I apparently didn't enclose a picture, although I think it just fell out and missed the deadline to re-send the information. Mainly due to a medical condition, the approved courier company not arriving to collect the passport until 10.30pm (scheduled 7am-7pm) and I can't really justify the expense of paying again.
However, my aunt is unwell in the US and I'm wondering if I can apply for and travel on an ESTA using my UK passport?
It's not a confirmed trip, just more a question about the feasibility of visiting.