It is not straightforward though. It would involve digging up his land to lay the pipe, and would prevent any future build in the area of the pipe because the water board does not permit building over mains water pipes in any circumstances.
It would also give you the right to access his land for maintenance and repair in the future.
This could seriously devalue his property.
Don't forget the landowner probably paid a lot of money to get the water to his property originally and he didn't do it for your benefit.
The water pipes would have to show on his Registered Title and Plan and a right would have to be granted to you and subsequent owners of your land.