This dialler problem seems to be quite widespread and is being discussed on another ntl user forum familiar with many users here :p :p .
I got caught despite having Spybot, Adaware and Spywareblaster installed. Dunno how the damned thing installed itself, but it did. Fortunately in line with ICSTIS it cut off before the >£20 limit. There was no software installed associated with the dialler just an extra entry in my dial up connections settings !
I've unplugged the dial up modem just in case !
ICSTIS have fined the company concerned (a Spanish outfit) and requested they reimburse all victims, but to date I have recieved no reply from them !
Beware you may think you are protected..I did !!