The layout of the main portion of the TK is UK ISO, minus the navigation keys (arrows etc.). The keys either side of the spacebar are a slight deviation from standard, with 1.5-unit CTRL keys and three 1-unit keys. Ordinarily these keys would all be 1.25-unit modifiers. So in short, you won't be able to buy a set that will fit the TK, but you might be able to piece something together depending on what you can find online (new and secondhand).
So I got reds in the kerfuffle, I have replaced the razer blackwidow with blues. I still prefer the blues to type on, but I am getting used to the reds. My main issue is the layout I regularly use the cursor keys and the number pad, and find myself inputting numbers instead of moving, or moving instead of inputting numbers. I am adapting to it though, I had planned to use it at work, but I don't think I could cope. I live in the cursors and number pad there.
Bit random, but I just received a dispatch text from Argos for this, order & item numbers match; but it states it will be delivered by "No Carrier"...! Definitely strange as I have (obviously) already received my order. Weird.
Good to know I'm not the only one! Looking back, I never received a dispatch notice originally, so maybe its just go stuck in some automated system and has somehow got flushed out but as its already been dispatched/delivered there's nothing for it to pull the info on carrier from...?