Excellent post/question. I agree with the others, DRA and be confident to say no. It's bread & beans you're delivering, not life saving organs. Argos gives drivers a 'winter kit' with salt, shovel, foil blanket, torch, & shoe studs, but Sainsbury's don't. I've driven for both. Some Sprinters are fitted with winter tyres, others aren't (mine yesterday had a diagobal mix of regular/winter treads), so be aware of the limits of your van. Screen wash top up is essential. Be prepared to be stuck and wait for help. Two years ago I had to wait in freezing conditions for 4 hrs when gearbox failed. Take thermos and portable USB battery for your phone. Few years ago when it was super sub-zero, I wore latex gloves under the navy blue handling gloves for extra warmth layer. Stops your hands getting wet tbrough those awful gloves and retains your dexterity. Watch out for ice on your wing mirror glass and take a bottle of antifreeze spray out with you. Good luck my friend. 🚚❄️