Deadline to send old BRP after successful administrative review?

[drgold]

Hello,

I applied for an administrative review and received an email stating that my application was successful, and that they've sent me a letter by post that says where I should send my old BRP, so that it can be corrected. However, 4-5 working days after their letter was posted Royal Mail still hasn't delivered it, so I don't know where to send my BRP. Home Office mentioned a tracking number but Royal Mail's website says "The system is currently unable to confirm the status of your item".

I think probably Royal Mail is just being a bit slow so I'm happy to wait and be patient - but I don't want to miss any deadlines (it would be terrible to receive a letter on 13 July stating "You must send your old BRP to address xyz by 12 July"). Can anyone who has had a successful admin review comment on whether there is a deadline for returning one's old BRP after the admin review has concluded? If so I may try to get into contact to learn where I need to send it.

Many thanks.