Try
http://net4nowt.com/unmetered/index.htm as this is where you can get the gen on all the freebie ISP's (UK).
I have just started with Ezesurf (who are Dundee based). Cost is £39 one off charge and 24/7 free (0808) access to the server. They have not charged me yet (don't tell them) and I've been online about a month. The word is that they are about to fold over the next few weeks, but nothing from them to me just yet.
Just remember: you get nowt for nowt!
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400 Hertz but DC is easy