Allways since day one of driving , ive had my mum on my policys.
remember in 97 my 1.1l fiesta was 800 a year with my mum on the policy, best quote without her on it was 1200+ from memory!
the thing with puting you otherhalf on the policydoes make it cheeper, its when you try and get added to theres they moan as it costs more.