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Good afternoon, I am Lawyer Ak and I will be assisting you today.
If your relationship has broken down with your partner you can apply on the basis of your British child as he has seized your passport.
When is your visa your expiring?
You should also report to the police that your passport has been seized so you are able to get a new one.
You would need to apply for a new visa if your relationship has broken down. Why is your partner refusing to give your partner?
As I have mentioned above if it’s a case where you will no longer be on the spouse visa then you can look at thr parent route.