I thing the list needs another update. For example:

National/Local UK landline calls - 1899 is potentially cheaper (for calls over 4 minutes) at only 3p (By the way, does Euphony Free still exist, I can't find it)

0845 Evening - Surely BT is 1.5p (One.Tel 1.2p)

0870 Evening - Surely TalkTalk/One.Tel are cheaper at 3.8p

0870 Weekend - Surely BT is 2.0p and One.Tel is 1.5p

International - could we add it to the list with 1899 generally beating 18866's low prices (quite a few popular counties at 0.5p compared with 18866's 1p) [How do they do it?].

Perhaps others know of even better deals?