The problem with Tiscali/TalkTalk is they are rotten from the core, every element of their service seems to fall foul of regulators and watchdogs, and they are constantly involved in some scam or swindle, and generating massive amounts of complaints. For all their faults, even BT can't hold a candle to TalkTalks crappy service...
TalkTalk have a long and established history of leaving (particuarly new) customers without internet access for weeks, even months in a lot of cases. Then they have the reputation for increasing their prices willy-nilly.
Just this week they have been fined £2.5million for continuing to bill an estimated 62,000 customers who no longer have services from them. Routers going lost in the post, ending up all around the world, taking months to arrive at customers, not honouring price contracts etc... And thats before you even consider their shitty customer services!! I seem to recall it took you over a month of arsing about with their customer services telling you your not even a customer etc, before they got your connection installed.
Their biggest problem is, they seem to be totally profit driven, with zero interest in their customers. Everytime they have problems, and the numerous times they have been on Watchdog and other consumer shows, they always blame it on some crappy system they have running, they never hold their hands up and say we are getting it wrong, and things never improve (its 5 years since the horrors of new customer connections hit the headlines, and you yourself are proof they are still happening). They were on rip-off britain just a few weeks ago with people still experiencing problems with their internet connections amongst other issues.
It's easier to just avoid the ... than risk the problems - the risk is simply too high. Whilst no ISP is perfect, and all ISP's suffer some issues from time to time, the level of customer disastisfaction with TalkTalk seems to be extraordinarily higher than other ISP's. When a company like o2, for the mostpart, can get it "just right" (even if it is a couple of quid more expensive - not worked it out) why can't the others? Freefone customer support 24/7 based in the UK (no Indians asking you to speak clear English to them because they can't understand you), who know what they are talking about instead of just reading from a script and ending up at "computer says no" etc... Internet services that are lightning fast, no horror stories of people struggling for months to get connections, rewards given to loyal customers in the form of discounts, generally just a service that works and a company that seems interested in keeping you happy to keep your custom etc... and there are other smaller companies like them, but none of the big-boys follow their example?
o2 show it can be done, the only conclusion I can reach is that none of the other want to do it!