Is there any kind of rough and ready rule as to whether it's cheaper to have 
a home phone and mobile or just a mobile? I'm moving into a new house soon, 
and I'll be able to get cable internet, which means no need for a phoneline. 
I'll also be getting a work phone, which means I'll not be making many 
daytime calls. The majority of my calls are to three (that's three numbers, 
not the network) mobile numbers.

Would I be right in thinking the cheapest way to make calls to other mobiles 
is still likely to be my mobile (I've got Stop the Clock and 200minutes or 
so free a month and I can normally negotiate that for around £15/month)?