After moving from England to southwest Wales and discovering the scarcity of chicory here, I contacted Tesco about their product offerings, because when I put in my online grocery order, I look in a section actually called "lettuce and chicory" to see if chicory is available and it never is. So I finally contacted them in frustration (and confusion... it's in the section name!) after months of not seeing it, and that is when I learned that every store does its own supply ordering based on what sells and how quickly. (I guess the Welsh don't eat a lot of chicory...?)
I was advised that if there's something I want, I could ask the manager to order it, or at least order it in from another store, and it was up to them whether or not they would get it for me. So, yeah... if Karo Syrup is a thing that some Tesco stores get, we can ask our local Tescos to get it. Maybe we'll get lucky.
Meanwhile, I'm pretty sure I have seen it on Ocado's website in the past (I used them before we moved to Wales... I miss Ocado so much!), but it's not on there now.