No
Send an email.
i dont freaking know?
The Post Office will deliver it to Number 10 Downing Street.
send them in
yes
Through a post office.
via the post office.
the post office will send it back to the return address
There's a service called "General Delivery" that allows people to send you mail without knowing your actual address. The post office will hold mail until the person comes to the post office to pick it up, or until a certain amount of time has elapsed. You can go to your local post office to get more details on exactly how this works.
No, it will not be received.
no
Post office boxes, in comparison to mailboxes, offer owners a secure, safe, and 365 day a year, 24/7 access to their mail without ever having to hold it.