Yes we do. Well, theoretically anyway - you know those electricity poles with 4 cables above each other? That's 3 phase. Usually each house just gets one phase but I guess theoretically having 3 phase would just be a matter of connecting up the other wires too.
I'd be surprised if you could actually convince suppliers to do that for a house though, and definitely not for £1300.
This is the same the world over. Power is generated and distributed as 3 phase because it is better for the generators and it makes better use of the power cable since you don't require a neutral for a balanced 3 phase load.
I'd be surprised if you could actually convince suppliers to do that for a house though, and definitely not for £1300.