Yeah your right no special access with ADT. I remember back in the day that Thorn had some special access but that was a long time ago.
All the settings were correct it was me on the software side. It was a G3 panel not dimension on 5.6 I think firmware dimension came in after version 6.
I normally program everything by hand even the 520 panels probably like most engineers.
But a 520 in Tesco that someone else has done was only going to be a software option for me.