changing address after application

[Rayking]

I hope more experienced member can help me out with this. If one changes address after applying for spouse visa and I've informed them of the change of address.
Would they ask for a new tenancy agreement? And a letter from landlord, if my Mrs is also a witness to the agreement.
It's a bit confusing but a question on here has set my mind on this confusion. Will be grateful for your experienced opinions.
Thanks for your help as usual.

[SoHopeful]

Is this once the application is complete and you have received the visa or just after submitting the application?

[Rayking]

Thank you sohopeful, I meant after submitting the application, the first 2 letters(acknowledgement & biometrics) have come through though,but had to move.