Tesco:
"For deliveries to a residential apartment block, we will generally deliver to the front door of your apartment. However, we reserve the right to deliver only to the main entrance of the property if the driver believes it is unsafe or not practical to deliver to your apartment front door."
https://www.tesco.com/help/terms-and-conditions/grocery/
Asda:
""Where the only access to your front door is by stairs, for example in an apartment block that does not have a lift, our driver will call you and arrange to meet you in a communal area on the ground floor for you to collect your goods.
If you live in a block of flats and there is an accessible lift in working order, our driver will take the goods to your front door. We always reserve the right to deliver only to the main entrance of the delivery address."
https://www.mirror.co.uk/news/uk-news/asda-apologises-customer-after-telling-11862235
Sainsbury's:
"We will always deliver to the front door of your house or flat. From Sunday 30th August 2020, your delivery will not be bagged. Safety is our highest priority and our colleagues will continue to follow social distancing guidelines and will not enter your home when they deliver your order but can assist you in transferring your order from the totes to your own bags or containers. Our drivers also have sanitiser which they will continue to use before and after each delivery. Please have bags or a suitable container ready for when your shopping arrives or during your collection slot. If you are shielding, we would ask that you leave bags outside your door so that the driver can transfer your shopping into your bags for you."
https://help.sainsburys.co.uk/help/delivery-collection/delivery-service-information
Ocado:
"If you live in a flat, our friendly Ocado drivers will attempt to deliver your order to your front door. However, there may be occasions where our driver is unable to deliver your shopping safely or efficiently. In this instance, your driver may call to ask if they can meet you outside your building instead"
https://help.ocado.com/hc/en-us/articles/4405286812946-I-live-in-a-flat-apartment-will-you-deliver-to-my-front-door-
Morrison's:
"Morrisons does not specifically mention deliveries to blocks of flats under the terms and conditions. However, a spokeswoman said drivers will deliver to the floor of any flat, regardless of the level. However, there could be some circumstances when alternative arrangements are made, such as if a lift is not working or if there were safety concern"
https://www.stokesentinel.co.uk/news/after-asda-apology-should-high-1079052
Waitrose. (Quote from Mumsnet, as there seems to be nothing relevant on their website):
"Waitrose, tesco, sainsburys and asda all deliver to our second floor flat"
https://www.mumsnet.com/Talk/am_i_being_unreasonable/2401972-For-those-than-live-in-a-first-second-third-floor-flat