Call through numbers that are free via inclusive minutes are scarce these days so its always good to see new ones come out. Following from this post, pre-dial have re-launched 2 call through numbers
01635-578-107 and 01635-578-562
in addition to 01793 23 82 80
See this post at nifty list forum to see how the 2 new numbers work.
0845/0870
the 01635 numbers allow you to call 0845 and the 01793 number allows 0845 and weekend 0870. Please check the forum for updates on 0845/0870 usage. You can test it yourself as well to verify.