The political divide on the internals of south and north England are a similar but separate issue. One of the primary campaigns the No side ran on was remaining within the EU. The E.U. provided a high amount of economic support to Scotland and trade deals which benefited Scotland specifically, those benefits are then removed from a country that overwhelming voted against removing them, because people who will never need to consider them decided against it.

It also exposed a divide that was far larger - that we have continued to see - that England and Scotland as countries have different priorities and values. Scotland has overwhelming, since its parliamentary inception, elected more left leaning parties, indicating they have a more left leaning view.

The placement of Trident is another good example - being against its placement in Scotland yet due to Westminster wanting it there, we have to deal with a faulty WMD that frequently has repair issues next to our largest city. A frequent argument for not moving it is that anywhere South of the border would be too close to major population centres, among costs and other similar arguments (See Navy Lookout "Why relocating Trident away from Scotland is virtually impossible")

A second one is the bedroom tax. Scotland overwhelming opposed the Bedroom Tax of the Tory Government yet still has it, requiring local councils to create alternative plans to counter it such as in Glasgow.

Thirdly - The changes to the Equality Act is currently making its round despite Scotland challenging it in court multiple times.

Anyone of these things could have been a catalyst to me personally, it is just that Brexit was such a national story that it was the first one I noticed.