Hi scottishlemonade
Universal Credit is the same in Scotland as in England. If you are placed in the Support/LCWRA group you don't have to do work related activities but you do if you are in the WRAG/LCW group.
The DWP cannot stop you from being in a relationship but that is different from " living together ". 2 people living together generally get less total Benefits than the same 2 people living apart.
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems