今天刚收到HO邮件回复关于指纹如下
A Biometric Notification Letter (BNL) has been sent to you today by first class post.
You should submit your biometrics at any participating Post Office within two working days of the date on the BNL to allow us to process the application within the published service level agreement of 10 working days.
那我是不是最迟周五或之前一定要到邮局去处理这个指纹和拍照？有没有必要先等那BNL到了才去呢？回复里虽说是by first class post，但是一般都是1-3天工作日，如果周五都还没收到信，是不是也得去处理？