The company is in the UK because it's in the UK.

The Zetec has also been around the the UK much longer with more use than the US. Mondeos, Fiestas, Foci all with Zetecs.
Why was TH the only one offering to sell the kits? Because he kicks ass.

TH also has his own shop. Unfortunately there wasn't any demand. I think the timing was a little off. The Focus still hadn't been around enough.
BP