Ocado being the worst to my knowledge.
I had a tray of organic chicken in my basket this morning at £8.80.
Loaded it up an another browser a few hours later (to rethink my list) and noticed that now it is showing as £9.28.
My last order of chicken went up by a whopping £2 last week. I am seeing this across the board, in other supermarkets, and also noticed that with Ocado at least, a good deal of it occurred after the new website reboot.
Has anyone else noticed this? The hikes I've seen at Tesco recently are often hidden temporarily by clubcard deals.