The details are in the link. You do have to print a label to put on the parcel if you plan to use the locker box though so I don't think it will be of use to you. https://pages.ebay.co.uk/promos/inpostpromotion/
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)