I'm not going to be able to help but only to commiserate, as I'm in the same boat. I'm the same kind of "fakey" coffee-soul as you. In the US I liked my hazelnut flavored ground coffee coupled with my hazelnut flavored liquid creamer. It was how I liked it, even though I know serious coffee lovers and purists think of this as sacrilege; one time I asked on here, and everyone flocked in to tell me that that creamer was additive laden crap that I shouldn't be consuming. Well I know that, lol! But if it's my worse vice then I'm doing pretty good and I don't care.
I have found neither the flavored creamer nor flavored coffee readily available here -- readily meaning I can't pick it up at Tescos or Sainsburys. You can find the flavored coffee online. But creamer, I've given up and simply use the powdered Coffeemate. But it's not the same, and in over a year of being here I still can't make myself a cup of coffee that duplicates what I enjoyed making for myself in the US. You will probably not find anything in the UK exactly like the creamer you and I used.