Covid test by mail - post box times?

[Triffid1]

I have to take a Covid home test ahead of a procedure in hospital next week. The first instruction is to check collection times at a priority post box which has final times for normal mail and then later ones, and Sunday ones, for Covid. I need to take the test Saturday or Sunday.

I'm finding it hard to believe that I can just drop it through a post box and then magically, on a sunday or late on a Saturday, a post office worker will come and dig it out on Sunday?

Is this how it works? I'm not missing some key instruction?

[I appreciate this seems like a really dumb question but I'm really finding it hard to believe that my little post box in the middle of my little rural side street is really getting an EXTRA post office visit on a Saturday AND a new one on a Sunday?]

Royal mail website, put the Royal Mail tracking code in the box not the vaccine code. Same as you would for a signed for delivery

Oops that was for @FinallyHere - it's the Royal Mail track and trace service. (Not to be confused with test and trace)

Thank you @InnaBun

I had foolishly not taken a record of the different numbers.

Our test samples were posted for collection at 15:30 on Sunday, results emailed 3am on Tuesday.

Thankfully negative. Phew.