Supermarket precautions when delivering to those self-isolating

A few days ago, I booked a delivery from Tesco (2.5 weeks to wait). It was quite clear on their site that you were self-isolating, you had to say so in the 'instructions for driver' box.
What wasn't as clear, but that I found elsewhere, was that they will then deliver in bags and leave them at your door.

Today, I booked another delivery, this time with Asda, to come about a week later.
On their site, I never saw anything about telling them if you were self-isolating, though I have seen newspaper reports that they are doing the same as Tesco.

Has anyone else ordering from Asda been asked if they are self-isolating? I'm not used to their site, so maybe I missed something.
(I don't know what I was doing wrong, but it took me six attempts to complete the check-out process!)