On 12/01/16 09:12, Vic wrote:
I am going to fit an outside water tap. Is it usual/good practice to have the
tap and the spur off the water main isolatable inside the house?


Yes - and a slope downwards, so opening the tap with the isolator off
drains the pipe.

*However* if the tap is tight to the wall with the pipe running directly
through the wall into the tap, IME in the south, it's unlikely to freeze.