I can't believe anyone can have a shocking bad service from ADSL24, maybe i just been lucky. Sure you may have problems and their service may not suit you, but shocking is not a work I would use.
But then i don't know the full story.
I do know that if you go from one ISP to another via MAC or any other way to be honest it is best to tell the ISp you are moving from when you have been connected to your new supplier. Sure you should not have to as it all should be automatic, but it is not and you do, simple as that
Desktop machine now powered by windows 7 pro 64bit , laptop by ubuntu
On ADSL24 using C&W network.