Can I use M&S gift cards on Ocado?

[HolidayMiracle]

I assume not but thought I'd ask here since google isn't helping.

I should've thought you can, actually. Just as you can use JL at Waitrose and vice versa.

But I'd be wrong . . .

Well you might be wrong but you are far bettter at googling than I am @LetHimHaveIt - thank you!

Ocado says no