I had a horrendous time with them 6 or 7 years ago and have given them a swerve since, but the tariff checker tools I'm using are showing that the saving I could make if I switch to them is double that offered by everyone else. In real terms, this amounts to about £25 less a year, is it worth it? Or will I end up paying £25 in calls to their customer services team if I have problems with them/billing etc.?