In reply to LastBoyScout:
Yep, what Jenny C says. Unless I've missed something it's only a 1 month commitment so you've very little to lose. If it's awful you move to someone else and it cost you 5p to find out.
After the sweetener period runs out you can move to another ridiculously cheap deal, or sometimes even just sign up again with a different email address.
I had similar thoughts when I was in almost exactly the same position looking at Lebara at the top of that list, but it's worked out great.
If things are too good to be true on MSE they normally seem to get some sort of warning banner.
Post edited at 19:03