You're surely not wrong that a lot of things would need to be done without, but I'd like to think that if I were 'king of M&S' I could have identified a subset of merchandise that could be loaded into a suitable interim solution like Shopify within say, 4 weeks, if the only other option was forgoing all online sales for 12 weeks +.

That would also take a lot of the pressure off of the "full recovery team."

Of course, the real situation must be 100x more complex than I'm imagining it so "I'd like to think" != "I am confident"