The service would not be "Running Drunk Tank x located at y with a capacity of 15 inmates". That would assume telling the police they had reached their quota of arrests for the night. It would be "Receiving and monitoring people arrested by the police for being drunk". At least I assume so, from the scant information provided. Like when you tender for a care contract, it's not "Care for everyone assessed as needing care in the coming year", but "Care for the following 63 people in area x".
Tesco's distribution is fixed on the basis of known delivery points, known goods, and known quantities. They don't ask firms to give them a price including deliveries of whatever goods they may decide to start stocking in outlets they have still to disclose.
Yes they do.
Unless you think they publish to all who tender all the new stores they are going to open and all the new lines they will stock, bearing in mind a distribution centre will last for decades. And as for known quantities, well there there was a 4% swing over the last 3 years