Landlines
Day/Evening - Call 18866 - 1p/min + 1p con
Weekend - OneTel - Free

Mobiles
Day - Call 18866 - 10p/min + 1p con
Evenings - 08444848899 via Xfone - 3.83p/min
Weekend - Call 18866 - 2p/min + 1p con

0845
Day - Xfone - 2.98p/min
Evening - BT - 1p/min + 5p min
Weekend - BT - 1p/min + 5p min

0870
Day - Xfone - 5.96p/min
Evening - Xfone - 3.4p/min
Weekend - BT - 2p/min + 5p min

0871 (G7)
Day/Evening/Weekend - Xfone - 7.66

0844 (G6)
Day/Evening/Weekend - Xfone - 3.83

Xfones rates in the pdf file is wrong as it show the rates for UK moved up one place (ie. g7 rates show as g6 rates, etc) I talked to the Support & he confirmed it's wrong. If you can decipher it then the data is correct.

I just found out that the data for

Xfone

shown on the Telco Residential List is out of date, so I shall be having words with Magsys (as will Xfone no doubt)!

I agree with your data except that BT's Option 1 rates on the are as follows;

Evening & Weekend rates for 0845 are 1p/min (5p minimum) and !!
Weekend rates for 0870 are 1.5p/min (5p minimum) and !!

I take it from the fact you mention OneTel that you're with them? I don't think I've got enough use for Xfone to take them on as well. Thanks for the info though.  

I Know !!  That's where I tried to get my information from ?
The link on the Xfone site gives you the rates in a PDF file, which is wrong. I've just told their Techies AGAIN and they're correcting it now. I also talked to Magenta Systems who have the Telco Comparisons and they say that the prices shown were supplied by Swiftnet (Xfone) so it's upto Xfone to sort it & provide updated info.