So Neil rings me up: "I got everything, but they didn't have the celery root."
"Did you check the organic side, like I said?" "Yep."
Then it strikes me: Is it called celery root or celeriac here? "Did you see celeriac?"
"I don't know, I wasn't looking for it."
I check Waitrose Deliver. Yep - it's celeriac.
*bangs head*
Oh - and there were 2 missed calls on my mobile - so presumably he tried calling while I was in the shower... if I hadn't been, I could have told him BEFORE he finished at Waitrose, and gotten it!