If your a Sky Customer with a BT Landline  they will give you inclusive evening and weekend calls to 01/02 geographical numbers if you ask them. Its not something they have promoted heavily to longer standing existing customers. As they a only cps your calls, you can still use the likes of www.18185.co.uk in conjunction with it.

Inclusive Calls last up to an hour, after which 0.8p per minute rates apply for UK calls. Its a 30 day contract.

http://www.sky.com/portal/site/skycom/skytalk

However, if you're not a Sky TV subscriber but have a BT landline, Primus Saver Optioon 2 CPS will give you inclusive evening and weekend calls of up to 90 minutes* to 01/02 geographical numbers for no monthly fee whatsoever.  As with all CPS providers, 1899, 18185 and 18866 (and the 1280 prefix to 'hop back onto BT' for individual calls) can be used in conjunction with it.

* 1p/minute charge applies if you chat for longer than 90 minutes and forget to hang up and redial.

Its not something they have promoted heavily to existing customers.
if you are sign in for new subscription online, it will  be prompted for this service

gudman wrote on May 8^th, 2007 at 2:49pm:

Its not something they have promoted heavily to existing customers. if you are sign in for new subscription online, it will  be prompted for this service

If you read my post i clearly mention existing customers,not new ones. I have amended my post to make it clearer.