When you are viewing the More Information section as a member of the public (you can try this by using an Incognito or Private browsing window or by simply logging out from AChurchNearYou.com) it shows only the vicar's name and title, no other information is displayed.
The Legacy data is just that, it's legacy. It's a record of the data which was brought across from the old AChurchNearYou. The data is now static and will remain on the site as a record for the foreseeable future.
The Advanced section is not visible to the public (you can try this for yourself by using an Incognito or Private browsing window or by simply logging out from AChurchNearYou.com) therefore only Editors of the church can view the Legacy ACNY data.