Well today was my migration day to Zen Internet and so far so good. The changeover went very smoothly and I only lost my connection for a couple of minutes. Entered my new details into the router and I was away.
It is definitely noticeably quicker and the speed tests at
ADSL Guide confirm it.
I have only had occasion to speak to their support desk once concerning setting up of extra e-mail boxes and they answered the phone almost immediately and were very helpful.
Too early for me to really recommend them yet but it is just good to be away from the mess that is now BTYahoo!!