How to delay biometrics for PBS dependent extension when using IDV App

[Poornisharma]

Hello Everyone,

My husband and child will apply for PBS - Dependent extension in the month of March. They both are on depdendent Visa where I am the main applicant. I will get my ILR next month.
Now, although they will apply for extension but we don't want to book biometrics and delay it until they both will be eligibile to apply ILR post which we will vary the application.
Please can someone suggest how to delay biometrics when we get invite to use IDV app? I got to know in some cases when you have previosuly used IDV they then it sometimes not even ask for biometrics and application is sent for consideration. Please can you guide me here.

I also not some senior members had suggested to apply ILR & then delay biometrics until eligible. This route is also open but I would prefer PBS extension & then vary application if that is possible. Anyways we will get the full refund of PBS hence both options work fine

Regards