Dear Umamah,

Thank you for your question.

You can use your passport expiring in June 2021 for an application(from within UK) which will be submitted in May 2021. The visa/leave will be issued in a separate Biometric Residence Permit, which is not connected to a particular passport number, it is only connected to a combination of your name, date of birth and nationality, i.e. to your Home Office reference.

Filing application with an Expired Passport:

You can even file an application using an expired passport, however, you may have to produce another form of valid identification document ('ID') along with your expired passport, such as a UK Driving Licence, ID issued by an UK Employer, Student ID by a UK Educational Institution, etc.

The type of ID which can be accepted as alternate ID is at the discretion of the Home Office, hence, you should take the advice of a qualified immigration adviser when submitting alternate ID, if your passport is expired on the date of application (i.e. the date of payment of the Home Office / UKVI fees)

We have successfully filed applications using an alternate ID when the applicant's passport was expired. We are qualified to provide immigration advice and application assistance with the OISC at Level 3 (Advocacy & Appeals)

If you need advice with respect to your specific circumstances on any aspect of your application or any other UK Immigration advice, please arrange a video/audio consultation at:

https://www.visa-solutions.co.uk/bookings-checkout/consultation-via-video-audio-call

Yeah, I remember seeing that as well when I first applied for the spouse visa. I guess it just makes sense that there should be 6 months left on the passport's validity as if the applicant gets a refusal decision, the person won't be prone to overstaying.