XF 2.1 How to make location viewable to admin but not to users

[Mr Lucky]

I want to have location asa required field during registration, but not viewable on a member's profile.

ie so admin can see the location in the user's profile in ACP, and also see it in the database table

(I have experimented with custom user filed form this, but cannot find a way to display a column f entries in the table)

Thanks