Immigrationboards.com

Hi Guys,

I am applying naturalisation for my wife. I am a British Citizen.
Her current passport is 7 years old and still valid for another 3 years.

Does she still need to submit previous expired passport for her naturalisation application?

No - in this case only the current valid passport. There is no requirement to provide previous passport(s) unless they also cover part of the residency period which can happen. There's no requirement as such to provide all previous passports.