Document requirements: Old passports?

Quick question re documents:

I am currently working on my FLR (M) extension. (Second 2.5yr period)

I am looking at the documents checklist from my application and it simply says "The passport issued by USA for [me]).

Looking at my old folder for my first FLR (M), I seem to have scanned ALL of my previous passports dating back to the 1990s. Was that required? If so, is that still required? I do not see anywhere in the document list where it is asking for previous passports.

Fairly sure I am good with all of my other document checks, so thanks in advance if anyone can answer this question for me!

You only need to include passports that you have held SINCE moving to the UK on your fiance visa.

So, if you are still using the same passport that has your fiance visa sticker in it, then you only need to include that passport.

If you have renewed your passport since moving to the UK, you need to include your current passport and the old passport that contains your fiance visa.

Thanks a bunch. That makes sense! Fortunately, it is the same passport that I had arrived in.