A friend of mine recently joined 08002go.
I went to his home and checked it out. It seems very good, but if your interested, they are limiting new subscribers, so get in quick.
Apparently, as they improve their bandwidth, then they accept more subscribers, so their server does not become over loaded.
Its a 24 hour service, no call charges for a monthly subscription of £9.98p.
I am now looking seriously at joining.
http://www.08002go.com/
Hope this helps.