There's a "common purpose here to get the virus down" so people can enjoy Christmas, a minister says.
It will include a top level of measures more rigorous than those south of the border.
Pubs, restaurants and non-essential shops will shut when the 17-day lockdown starts at 18:00 BST.
Authors say no child must go hungry this winter, amid continuing row over free school meals.
The amount of retail sales saw a 1.5% rise last month, boosted by DIY and garden items.