You can get married in Scotland, it's true, but south of the border you again need parental consent. I suspect that there are probably a few who'd like that law changed anyway to make it more restrictive.
International human rights efforts by children's rights campaigners are to raise the legal age for marriage for all children until they are 18, so I would not ever mention the fact that children can get married at 16 in Scotland as a positive measure to justify lowering the age for a GRC.
In this and other issues, Scotland is out of step with the broad consensus internationally that children must be protected until the age of 18.
Don't even get me started on the moronic consent policy in Scotland that mandates that children from the age of 12 must give permission to their parents to be involved in their medical care. It's a blanket policy completely in conflict with the UN Convention on the Rights of the Child, which mandates that the developing capacities of the (individual) child must be taken into account.
My GP told me this is an ill-considered change in practice that puts real children at risk of real harm. (He had a patient die and believes that wouldn't have happened without that policy.)
But that's not just for medical consent. I was told that my son had to consent himself to a data protection issue when he turned 12. I asked my son's school and then the local authority how they had ensured that these children could understand what they were consenting to, somethingthey are obliged to do when dealing with children. Communal shrug. It's just the policy, I was told.
Yeah, lots of carefully considered, child friendly policies hereabouts...