Have you gotten it from TK? When you contact your guy, ask him is it a line for Ireland, as VM Eire and VM UK are two totally different animals, I had someone from Eire try one out just to see, and they are different. The only person on here that I know has cable in Eire is Cactikid, he might be able to try it for you and tell you is it your set up, or the line.
Also, is this a new set up, or have the channels just gone down after being working for a while? With a set up that was working, chances are it is your line.